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Driver core updates for 5.11-rc1

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Here is the big driver core updates for 5.11-rc1
 
 This time there was a lot of different work happening here for some
 reason:
 	- redo of the fwnode link logic, speeding it up greatly
 	- auxiliary bus added (this was a tag that will be pulled in
 	  from other trees/maintainers this merge window as well, as
 	  driver subsystems started to rely on it)
 	- platform driver core cleanups on the way to fixing some
 	  long-time api updates in future releases
 	- minor fixes and tweaks.
 
 All have been in linux-next with no (finally) reported issues.  Testing
 there did helped in shaking issues out a lot :)
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the big driver core updates for 5.11-rc1

  This time there was a lot of different work happening here for some
  reason:

   - redo of the fwnode link logic, speeding it up greatly

   - auxiliary bus added (this was a tag that will be pulled in from
     other trees/maintainers this merge window as well, as driver
     subsystems started to rely on it)

   - platform driver core cleanups on the way to fixing some long-time
     api updates in future releases

   - minor fixes and tweaks.

  All have been in linux-next with no (finally) reported issues. Testing
  there did helped in shaking issues out a lot :)"

* tag 'driver-core-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (39 commits)
  driver core: platform: don't oops in platform_shutdown() on unbound devices
  ACPI: Use fwnode_init() to set up fwnode
  misc: pvpanic: Replace OF headers by mod_devicetable.h
  misc: pvpanic: Combine ACPI and platform drivers
  usb: host: sl811: Switch to use platform_get_mem_or_io()
  vfio: platform: Switch to use platform_get_mem_or_io()
  driver core: platform: Introduce platform_get_mem_or_io()
  dyndbg: fix use before null check
  soc: fix comment for freeing soc_dev_attr
  driver core: platform: use bus_type functions
  driver core: platform: change logic implementing platform_driver_probe
  driver core: platform: reorder functions
  driver core: make driver_probe_device() static
  driver core: Fix a couple of typos
  driver core: Reorder devices on successful probe
  driver core: Delete pointless parameter in fwnode_operations.add_links
  driver core: Refactor fw_devlink feature
  efi: Update implementation of add_links() to create fwnode links
  of: property: Update implementation of add_links() to create fwnode links
  driver core: Use device's fwnode to check if it is waiting for suppliers
  ...
This commit is contained in:
Linus Torvalds 2020-12-15 14:02:26 -08:00
commit 7240153a9b
31 changed files with 853 additions and 796 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/acpi/property.c
View file

@ -76,7 +76,7 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
return false;
dn->name = link->package.elements[0].string.pointer;
dn->fwnode.ops = &acpi_data_fwnode_ops;
fwnode_init(&dn->fwnode, &acpi_data_fwnode_ops);
dn->parent = parent;
INIT_LIST_HEAD(&dn->data.properties);
INIT_LIST_HEAD(&dn->data.subnodes);

2
drivers/acpi/scan.c
View file

@ -1589,7 +1589,7 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
device->device_type = type;
device->handle = handle;
device->parent = acpi_bus_get_parent(handle);
device->fwnode.ops = &acpi_device_fwnode_ops;
fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
acpi_set_device_status(device, sta);
acpi_device_get_busid(device);
acpi_set_pnp_ids(handle, &device->pnp, type);

11
drivers/base/auxiliary.c
View file

@ -92,10 +92,15 @@ static int auxiliary_bus_remove(struct device *dev)
static void auxiliary_bus_shutdown(struct device *dev)
{
struct auxiliary_driver *auxdrv = to_auxiliary_drv(dev->driver);
struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
struct auxiliary_driver *auxdrv = NULL;
struct auxiliary_device *auxdev;
if (auxdrv->shutdown)
if (dev->driver) {
auxdrv = to_auxiliary_drv(dev->driver);
auxdev = to_auxiliary_dev(dev);
}
if (auxdrv && auxdrv->shutdown)
auxdrv->shutdown(auxdev);
}

1
drivers/base/base.h
View file

@ -133,7 +133,6 @@ extern void device_release_driver_internal(struct device *dev,
struct device *parent);
extern void driver_detach(struct device_driver *drv);
extern int driver_probe_device(struct device_driver *drv, struct device *dev);
extern void driver_deferred_probe_del(struct device *dev);
extern void device_set_deferred_probe_reason(const struct device *dev,
struct va_format *vaf);

2
drivers/base/class.c
View file

@ -210,7 +210,7 @@ static void class_create_release(struct class *cls)
}
/**
* class_create - create a struct class structure
* __class_create - create a struct class structure
* @owner: pointer to the module that is to "own" this struct class
* @name: pointer to a string for the name of this class.
* @key: the lock_class_key for this class; used by mutex lock debugging

611
drivers/base/core.c
View file

@ -46,15 +46,108 @@ early_param("sysfs.deprecated", sysfs_deprecated_setup);
#endif
/* Device links support. */
static LIST_HEAD(wait_for_suppliers);
static DEFINE_MUTEX(wfs_lock);
static LIST_HEAD(deferred_sync);
static unsigned int defer_sync_state_count = 1;
static unsigned int defer_fw_devlink_count;
static LIST_HEAD(deferred_fw_devlink);
static DEFINE_MUTEX(defer_fw_devlink_lock);
static DEFINE_MUTEX(fwnode_link_lock);
static bool fw_devlink_is_permissive(void);
/**
* fwnode_link_add - Create a link between two fwnode_handles.
* @con: Consumer end of the link.
* @sup: Supplier end of the link.
*
* Create a fwnode link between fwnode handles @con and @sup. The fwnode link
* represents the detail that the firmware lists @sup fwnode as supplying a
* resource to @con.
*
* The driver core will use the fwnode link to create a device link between the
* two device objects corresponding to @con and @sup when they are created. The
* driver core will automatically delete the fwnode link between @con and @sup
* after doing that.
*
* Attempts to create duplicate links between the same pair of fwnode handles
* are ignored and there is no reference counting.
*/
int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup)
{
struct fwnode_link *link;
int ret = 0;
mutex_lock(&fwnode_link_lock);
list_for_each_entry(link, &sup->consumers, s_hook)
if (link->consumer == con)
goto out;
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link) {
ret = -ENOMEM;
goto out;
}
link->supplier = sup;
INIT_LIST_HEAD(&link->s_hook);
link->consumer = con;
INIT_LIST_HEAD(&link->c_hook);
list_add(&link->s_hook, &sup->consumers);
list_add(&link->c_hook, &con->suppliers);
out:
mutex_unlock(&fwnode_link_lock);
return ret;
}
/**
* fwnode_links_purge_suppliers - Delete all supplier links of fwnode_handle.
* @fwnode: fwnode whose supplier links need to be deleted
*
* Deletes all supplier links connecting directly to @fwnode.
*/
static void fwnode_links_purge_suppliers(struct fwnode_handle *fwnode)
{
struct fwnode_link *link, *tmp;
mutex_lock(&fwnode_link_lock);
list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) {
list_del(&link->s_hook);
list_del(&link->c_hook);
kfree(link);
}
mutex_unlock(&fwnode_link_lock);
}
/**
* fwnode_links_purge_consumers - Delete all consumer links of fwnode_handle.
* @fwnode: fwnode whose consumer links need to be deleted
*
* Deletes all consumer links connecting directly to @fwnode.
*/
static void fwnode_links_purge_consumers(struct fwnode_handle *fwnode)
{
struct fwnode_link *link, *tmp;
mutex_lock(&fwnode_link_lock);
list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) {
list_del(&link->s_hook);
list_del(&link->c_hook);
kfree(link);
}
mutex_unlock(&fwnode_link_lock);
}
/**
* fwnode_links_purge - Delete all links connected to a fwnode_handle.
* @fwnode: fwnode whose links needs to be deleted
*
* Deletes all links connecting directly to a fwnode.
*/
void fwnode_links_purge(struct fwnode_handle *fwnode)
{
fwnode_links_purge_suppliers(fwnode);
fwnode_links_purge_consumers(fwnode);
}
#ifdef CONFIG_SRCU
static DEFINE_MUTEX(device_links_lock);
DEFINE_STATIC_SRCU(device_links_srcu);
@ -468,7 +561,7 @@ postcore_initcall(devlink_class_init);
* with runtime PM. First, setting the DL_FLAG_PM_RUNTIME flag will cause the
* runtime PM framework to take the link into account. Second, if the
* DL_FLAG_RPM_ACTIVE flag is set in addition to it, the supplier devices will
* be forced into the active metastate and reference-counted upon the creation
* be forced into the active meta state and reference-counted upon the creation
* of the link. If DL_FLAG_PM_RUNTIME is not set, DL_FLAG_RPM_ACTIVE will be
* ignored.
*
@ -491,7 +584,7 @@ postcore_initcall(devlink_class_init);
* Also, if DL_FLAG_STATELESS, DL_FLAG_AUTOREMOVE_CONSUMER and
* DL_FLAG_AUTOREMOVE_SUPPLIER are not set in @flags (that is, a persistent
* managed device link is being added), the DL_FLAG_AUTOPROBE_CONSUMER flag can
* be used to request the driver core to automaticall probe for a consmer
* be used to request the driver core to automatically probe for a consumer
* driver after successfully binding a driver to the supplier device.
*
* The combination of DL_FLAG_STATELESS and one of DL_FLAG_AUTOREMOVE_CONSUMER,
@ -555,6 +648,17 @@ struct device_link *device_link_add(struct device *consumer,
goto out;
}
/*
* SYNC_STATE_ONLY links are useless once a consumer device has probed.
* So, only create it if the consumer hasn't probed yet.
*/
if (flags & DL_FLAG_SYNC_STATE_ONLY &&
consumer->links.status != DL_DEV_NO_DRIVER &&
consumer->links.status != DL_DEV_PROBING) {
link = NULL;
goto out;
}
/*
* DL_FLAG_AUTOREMOVE_SUPPLIER indicates that the link will be needed
* longer than for DL_FLAG_AUTOREMOVE_CONSUMER and setting them both
@ -697,74 +801,6 @@ struct device_link *device_link_add(struct device *consumer,
}
EXPORT_SYMBOL_GPL(device_link_add);
/**
* device_link_wait_for_supplier - Add device to wait_for_suppliers list
* @consumer: Consumer device
*
* Marks the @consumer device as waiting for suppliers to become available by
* adding it to the wait_for_suppliers list. The consumer device will never be
* probed until it's removed from the wait_for_suppliers list.
*
* The caller is responsible for adding the links to the supplier devices once
* they are available and removing the @consumer device from the
* wait_for_suppliers list once links to all the suppliers have been created.
*
* This function is NOT meant to be called from the probe function of the
* consumer but rather from code that creates/adds the consumer device.
*/
static void device_link_wait_for_supplier(struct device *consumer,
bool need_for_probe)
{
mutex_lock(&wfs_lock);
list_add_tail(&consumer->links.needs_suppliers, &wait_for_suppliers);
consumer->links.need_for_probe = need_for_probe;
mutex_unlock(&wfs_lock);
}
static void device_link_wait_for_mandatory_supplier(struct device *consumer)
{
device_link_wait_for_supplier(consumer, true);
}
static void device_link_wait_for_optional_supplier(struct device *consumer)
{
device_link_wait_for_supplier(consumer, false);
}
/**
* device_link_add_missing_supplier_links - Add links from consumer devices to
* supplier devices, leaving any
* consumer with inactive suppliers on
* the wait_for_suppliers list
*
* Loops through all consumers waiting on suppliers and tries to add all their
* supplier links. If that succeeds, the consumer device is removed from
* wait_for_suppliers list. Otherwise, they are left in the wait_for_suppliers
* list. Devices left on the wait_for_suppliers list will not be probed.
*
* The fwnode add_links callback is expected to return 0 if it has found and
* added all the supplier links for the consumer device. It should return an
* error if it isn't able to do so.
*
* The caller of device_link_wait_for_supplier() is expected to call this once
* it's aware of potential suppliers becoming available.
*/
static void device_link_add_missing_supplier_links(void)
{
struct device *dev, *tmp;
mutex_lock(&wfs_lock);
list_for_each_entry_safe(dev, tmp, &wait_for_suppliers,
links.needs_suppliers) {
int ret = fwnode_call_int_op(dev->fwnode, add_links, dev);
if (!ret)
list_del_init(&dev->links.needs_suppliers);
else if (ret != -ENODEV || fw_devlink_is_permissive())
dev->links.need_for_probe = false;
}
mutex_unlock(&wfs_lock);
}
#ifdef CONFIG_SRCU
static void __device_link_del(struct kref *kref)
{
@ -890,13 +926,13 @@ int device_links_check_suppliers(struct device *dev)
* Device waiting for supplier to become available is not allowed to
* probe.
*/
mutex_lock(&wfs_lock);
if (!list_empty(&dev->links.needs_suppliers) &&
dev->links.need_for_probe) {
mutex_unlock(&wfs_lock);
mutex_lock(&fwnode_link_lock);
if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&
!fw_devlink_is_permissive()) {
mutex_unlock(&fwnode_link_lock);
return -EPROBE_DEFER;
}
mutex_unlock(&wfs_lock);
mutex_unlock(&fwnode_link_lock);
device_links_write_lock();
@ -960,11 +996,11 @@ static void __device_links_queue_sync_state(struct device *dev,
*/
dev->state_synced = true;
if (WARN_ON(!list_empty(&dev->links.defer_hook)))
if (WARN_ON(!list_empty(&dev->links.defer_sync)))
return;
get_device(dev);
list_add_tail(&dev->links.defer_hook, list);
list_add_tail(&dev->links.defer_sync, list);
}
/**
@ -982,8 +1018,8 @@ static void device_links_flush_sync_list(struct list_head *list,
{
struct device *dev, *tmp;
list_for_each_entry_safe(dev, tmp, list, links.defer_hook) {
list_del_init(&dev->links.defer_hook);
list_for_each_entry_safe(dev, tmp, list, links.defer_sync) {
list_del_init(&dev->links.defer_sync);
if (dev != dont_lock_dev)
device_lock(dev);
@ -1021,12 +1057,12 @@ void device_links_supplier_sync_state_resume(void)
if (defer_sync_state_count)
goto out;
list_for_each_entry_safe(dev, tmp, &deferred_sync, links.defer_hook) {
list_for_each_entry_safe(dev, tmp, &deferred_sync, links.defer_sync) {
/*
* Delete from deferred_sync list before queuing it to
* sync_list because defer_hook is used for both lists.
* sync_list because defer_sync is used for both lists.
*/
list_del_init(&dev->links.defer_hook);
list_del_init(&dev->links.defer_sync);
__device_links_queue_sync_state(dev, &sync_list);
}
out:
@ -1044,8 +1080,8 @@ late_initcall(sync_state_resume_initcall);
static void __device_links_supplier_defer_sync(struct device *sup)
{
if (list_empty(&sup->links.defer_hook) && dev_has_sync_state(sup))
list_add_tail(&sup->links.defer_hook, &deferred_sync);
if (list_empty(&sup->links.defer_sync) && dev_has_sync_state(sup))
list_add_tail(&sup->links.defer_sync, &deferred_sync);
}
static void device_link_drop_managed(struct device_link *link)
@ -1062,10 +1098,7 @@ static ssize_t waiting_for_supplier_show(struct device *dev,
bool val;
device_lock(dev);
mutex_lock(&wfs_lock);
val = !list_empty(&dev->links.needs_suppliers)
&& dev->links.need_for_probe;
mutex_unlock(&wfs_lock);
val = !list_empty(&dev->fwnode->suppliers);
device_unlock(dev);
return sysfs_emit(buf, "%u\n", val);
}
@ -1092,9 +1125,8 @@ void device_links_driver_bound(struct device *dev)
* the device links it needs to or make new device links as it needs
* them. So, it no longer needs to wait on any suppliers.
*/
mutex_lock(&wfs_lock);
list_del_init(&dev->links.needs_suppliers);
mutex_unlock(&wfs_lock);
if (dev->fwnode && dev->fwnode->dev == dev)
fwnode_links_purge_suppliers(dev->fwnode);
device_remove_file(dev, &dev_attr_waiting_for_supplier);
device_links_write_lock();
@ -1275,7 +1307,7 @@ void device_links_driver_cleanup(struct device *dev)
WRITE_ONCE(link->status, DL_STATE_DORMANT);
}
list_del_init(&dev->links.defer_hook);
list_del_init(&dev->links.defer_sync);
__device_links_no_driver(dev);
device_links_write_unlock();
@ -1385,10 +1417,6 @@ static void device_links_purge(struct device *dev)
if (dev->class == &devlink_class)
return;
mutex_lock(&wfs_lock);
list_del(&dev->links.needs_suppliers);
mutex_unlock(&wfs_lock);
/*
* Delete all of the remaining links from this device to any other
* devices (either consumers or suppliers).
@ -1439,139 +1467,267 @@ static bool fw_devlink_is_permissive(void)
return fw_devlink_flags == DL_FLAG_SYNC_STATE_ONLY;
}
static void fw_devlink_parse_fwnode(struct fwnode_handle *fwnode)
{
if (fwnode->flags & FWNODE_FLAG_LINKS_ADDED)
return;
fwnode_call_int_op(fwnode, add_links);
fwnode->flags |= FWNODE_FLAG_LINKS_ADDED;
}
static void fw_devlink_parse_fwtree(struct fwnode_handle *fwnode)
{
struct fwnode_handle *child = NULL;
fw_devlink_parse_fwnode(fwnode);
while ((child = fwnode_get_next_available_child_node(fwnode, child)))
fw_devlink_parse_fwtree(child);
}
/**
* fw_devlink_create_devlink - Create a device link from a consumer to fwnode
* @con - Consumer device for the device link
* @sup_handle - fwnode handle of supplier
*
* This function will try to create a device link between the consumer device
* @con and the supplier device represented by @sup_handle.
*
* The supplier has to be provided as a fwnode because incorrect cycles in
* fwnode links can sometimes cause the supplier device to never be created.
* This function detects such cases and returns an error if it cannot create a
* device link from the consumer to a missing supplier.
*
* Returns,
* 0 on successfully creating a device link
* -EINVAL if the device link cannot be created as expected
* -EAGAIN if the device link cannot be created right now, but it may be
* possible to do that in the future
*/
static int fw_devlink_create_devlink(struct device *con,
struct fwnode_handle *sup_handle, u32 flags)
{
struct device *sup_dev;
int ret = 0;
sup_dev = get_dev_from_fwnode(sup_handle);
if (sup_dev) {
/*
* If this fails, it is due to cycles in device links. Just
* give up on this link and treat it as invalid.
*/
if (!device_link_add(con, sup_dev, flags))
ret = -EINVAL;
goto out;
}
/*
* DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports
* cycles. So cycle detection isn't necessary and shouldn't be
* done.
*/
if (flags & DL_FLAG_SYNC_STATE_ONLY)
return -EAGAIN;
/*
* If we can't find the supplier device from its fwnode, it might be
* due to a cyclic dependency between fwnodes. Some of these cycles can
* be broken by applying logic. Check for these types of cycles and
* break them so that devices in the cycle probe properly.
*
* If the supplier's parent is dependent on the consumer, then
* the consumer-supplier dependency is a false dependency. So,
* treat it as an invalid link.
*/
sup_dev = fwnode_get_next_parent_dev(sup_handle);
if (sup_dev && device_is_dependent(con, sup_dev)) {
dev_dbg(con, "Not linking to %pfwP - False link\n",
sup_handle);
ret = -EINVAL;
} else {
/*
* Can't check for cycles or no cycles. So let's try
* again later.
*/
ret = -EAGAIN;
}
out:
put_device(sup_dev);
return ret;
}
/**
* __fw_devlink_link_to_consumers - Create device links to consumers of a device
* @dev - Device that needs to be linked to its consumers
*
* This function looks at all the consumer fwnodes of @dev and creates device
* links between the consumer device and @dev (supplier).
*
* If the consumer device has not been added yet, then this function creates a
* SYNC_STATE_ONLY link between @dev (supplier) and the closest ancestor device
* of the consumer fwnode. This is necessary to make sure @dev doesn't get a
* sync_state() callback before the real consumer device gets to be added and
* then probed.
*
* Once device links are created from the real consumer to @dev (supplier), the
* fwnode links are deleted.
*/
static void __fw_devlink_link_to_consumers(struct device *dev)
{
struct fwnode_handle *fwnode = dev->fwnode;
struct fwnode_link *link, *tmp;
list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) {
u32 dl_flags = fw_devlink_get_flags();
struct device *con_dev;
bool own_link = true;
int ret;
con_dev = get_dev_from_fwnode(link->consumer);
/*
* If consumer device is not available yet, make a "proxy"
* SYNC_STATE_ONLY link from the consumer's parent device to
* the supplier device. This is necessary to make sure the
* supplier doesn't get a sync_state() callback before the real
* consumer can create a device link to the supplier.
*
* This proxy link step is needed to handle the case where the
* consumer's parent device is added before the supplier.
*/
if (!con_dev) {
con_dev = fwnode_get_next_parent_dev(link->consumer);
/*
* However, if the consumer's parent device is also the
* parent of the supplier, don't create a
* consumer-supplier link from the parent to its child
* device. Such a dependency is impossible.
*/
if (con_dev &&
fwnode_is_ancestor_of(con_dev->fwnode, fwnode)) {
put_device(con_dev);
con_dev = NULL;
} else {
own_link = false;
dl_flags = DL_FLAG_SYNC_STATE_ONLY;
}
}
if (!con_dev)
continue;
ret = fw_devlink_create_devlink(con_dev, fwnode, dl_flags);
put_device(con_dev);
if (!own_link || ret == -EAGAIN)
continue;
list_del(&link->s_hook);
list_del(&link->c_hook);
kfree(link);
}
}
/**
* __fw_devlink_link_to_suppliers - Create device links to suppliers of a device
* @dev - The consumer device that needs to be linked to its suppliers
* @fwnode - Root of the fwnode tree that is used to create device links
*
* This function looks at all the supplier fwnodes of fwnode tree rooted at
* @fwnode and creates device links between @dev (consumer) and all the
* supplier devices of the entire fwnode tree at @fwnode.
*
* The function creates normal (non-SYNC_STATE_ONLY) device links between @dev
* and the real suppliers of @dev. Once these device links are created, the
* fwnode links are deleted. When such device links are successfully created,
* this function is called recursively on those supplier devices. This is
* needed to detect and break some invalid cycles in fwnode links. See
* fw_devlink_create_devlink() for more details.
*
* In addition, it also looks at all the suppliers of the entire fwnode tree
* because some of the child devices of @dev that have not been added yet
* (because @dev hasn't probed) might already have their suppliers added to
* driver core. So, this function creates SYNC_STATE_ONLY device links between
* @dev (consumer) and these suppliers to make sure they don't execute their
* sync_state() callbacks before these child devices have a chance to create
* their device links. The fwnode links that correspond to the child devices
* aren't delete because they are needed later to create the device links
* between the real consumer and supplier devices.
*/
static void __fw_devlink_link_to_suppliers(struct device *dev,
struct fwnode_handle *fwnode)
{
bool own_link = (dev->fwnode == fwnode);
struct fwnode_link *link, *tmp;
struct fwnode_handle *child = NULL;
u32 dl_flags;
if (own_link)
dl_flags = fw_devlink_get_flags();
else
dl_flags = DL_FLAG_SYNC_STATE_ONLY;
list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) {
int ret;
struct device *sup_dev;
struct fwnode_handle *sup = link->supplier;
ret = fw_devlink_create_devlink(dev, sup, dl_flags);
if (!own_link || ret == -EAGAIN)
continue;
list_del(&link->s_hook);
list_del(&link->c_hook);
kfree(link);
/* If no device link was created, nothing more to do. */
if (ret)
continue;
/*
* If a device link was successfully created to a supplier, we
* now need to try and link the supplier to all its suppliers.
*
* This is needed to detect and delete false dependencies in
* fwnode links that haven't been converted to a device link
* yet. See comments in fw_devlink_create_devlink() for more
* details on the false dependency.
*
* Without deleting these false dependencies, some devices will
* never probe because they'll keep waiting for their false
* dependency fwnode links to be converted to device links.
*/
sup_dev = get_dev_from_fwnode(sup);
__fw_devlink_link_to_suppliers(sup_dev, sup_dev->fwnode);
put_device(sup_dev);
}
/*
* Make "proxy" SYNC_STATE_ONLY device links to represent the needs of
* all the descendants. This proxy link step is needed to handle the
* case where the supplier is added before the consumer's parent device
* (@dev).
*/
while ((child = fwnode_get_next_available_child_node(fwnode, child)))
__fw_devlink_link_to_suppliers(dev, child);
}
static void fw_devlink_link_device(struct device *dev)
{
int fw_ret;
struct fwnode_handle *fwnode = dev->fwnode;
if (!fw_devlink_flags)
return;
mutex_lock(&defer_fw_devlink_lock);
if (!defer_fw_devlink_count)
device_link_add_missing_supplier_links();
fw_devlink_parse_fwtree(fwnode);
/*
* The device's fwnode not having add_links() doesn't affect if other
* consumers can find this device as a supplier. So, this check is
* intentionally placed after device_link_add_missing_supplier_links().
*/
if (!fwnode_has_op(dev->fwnode, add_links))
goto out;
/*
* If fw_devlink is being deferred, assume all devices have mandatory
* suppliers they need to link to later. Then, when the fw_devlink is
* resumed, all these devices will get a chance to try and link to any
* suppliers they have.
*/
if (!defer_fw_devlink_count) {
fw_ret = fwnode_call_int_op(dev->fwnode, add_links, dev);
if (fw_ret == -ENODEV && fw_devlink_is_permissive())
fw_ret = -EAGAIN;
} else {
fw_ret = -ENODEV;
/*
* defer_hook is not used to add device to deferred_sync list
* until device is bound. Since deferred fw devlink also blocks
* probing, same list hook can be used for deferred_fw_devlink.
*/
list_add_tail(&dev->links.defer_hook, &deferred_fw_devlink);
}
if (fw_ret == -ENODEV)
device_link_wait_for_mandatory_supplier(dev);
else if (fw_ret)
device_link_wait_for_optional_supplier(dev);
out:
mutex_unlock(&defer_fw_devlink_lock);
mutex_lock(&fwnode_link_lock);
__fw_devlink_link_to_consumers(dev);
__fw_devlink_link_to_suppliers(dev, fwnode);
mutex_unlock(&fwnode_link_lock);
}
/**
* fw_devlink_pause - Pause parsing of fwnode to create device links
*
* Calling this function defers any fwnode parsing to create device links until
* fw_devlink_resume() is called. Both these functions are ref counted and the
* caller needs to match the calls.
*
* While fw_devlink is paused:
* - Any device that is added won't have its fwnode parsed to create device
* links.
* - The probe of the device will also be deferred during this period.
* - Any devices that were already added, but waiting for suppliers won't be
* able to link to newly added devices.
*
* Once fw_devlink_resume():
* - All the fwnodes that was not parsed will be parsed.
* - All the devices that were deferred probing will be reattempted if they
* aren't waiting for any more suppliers.
*
* This pair of functions, is mainly meant to optimize the parsing of fwnodes
* when a lot of devices that need to link to each other are added in a short
* interval of time. For example, adding all the top level devices in a system.
*
* For example, if N devices are added and:
* - All the consumers are added before their suppliers
* - All the suppliers of the N devices are part of the N devices
*
* Then:
*
* - With the use of fw_devlink_pause() and fw_devlink_resume(), each device
* will only need one parsing of its fwnode because it is guaranteed to find
* all the supplier devices already registered and ready to link to. It won't
* have to do another pass later to find one or more suppliers it couldn't
* find in the first parse of the fwnode. So, we'll only need O(N) fwnode
* parses.
*
* - Without the use of fw_devlink_pause() and fw_devlink_resume(), we would
* end up doing O(N^2) parses of fwnodes because every device that's added is
* guaranteed to trigger a parse of the fwnode of every device added before
* it. This O(N^2) parse is made worse by the fact that when a fwnode of a
* device is parsed, all it descendant devices might need to have their
* fwnodes parsed too (even if the devices themselves aren't added).
*/
void fw_devlink_pause(void)
{
mutex_lock(&defer_fw_devlink_lock);
defer_fw_devlink_count++;
mutex_unlock(&defer_fw_devlink_lock);
}
/** fw_devlink_resume - Resume parsing of fwnode to create device links
*
* This function is used in conjunction with fw_devlink_pause() and is ref
* counted. See documentation for fw_devlink_pause() for more details.
*/
void fw_devlink_resume(void)
{
struct device *dev, *tmp;
LIST_HEAD(probe_list);
mutex_lock(&defer_fw_devlink_lock);
if (!defer_fw_devlink_count) {
WARN(true, "Unmatched fw_devlink pause/resume!");
goto out;
}
defer_fw_devlink_count--;
if (defer_fw_devlink_count)
goto out;
device_link_add_missing_supplier_links();
list_splice_tail_init(&deferred_fw_devlink, &probe_list);
out:
mutex_unlock(&defer_fw_devlink_lock);
/*
* bus_probe_device() can cause new devices to get added and they'll
* try to grab defer_fw_devlink_lock. So, this needs to be done outside
* the defer_fw_devlink_lock.
*/
list_for_each_entry_safe(dev, tmp, &probe_list, links.defer_hook) {
list_del_init(&dev->links.defer_hook);
bus_probe_device(dev);
}
}
/* Device links support end. */
int (*platform_notify)(struct device *dev) = NULL;
@ -2196,7 +2352,7 @@ static int device_add_attrs(struct device *dev)
goto err_remove_dev_groups;
}
if (fw_devlink_flags && !fw_devlink_is_permissive()) {
if (fw_devlink_flags && !fw_devlink_is_permissive() && dev->fwnode) {
error = device_create_file(dev, &dev_attr_waiting_for_supplier);
if (error)
goto err_remove_dev_online;
@ -2427,8 +2583,7 @@ void device_initialize(struct device *dev)
#endif
INIT_LIST_HEAD(&dev->links.consumers);
INIT_LIST_HEAD(&dev->links.suppliers);
INIT_LIST_HEAD(&dev->links.needs_suppliers);
INIT_LIST_HEAD(&dev->links.defer_hook);
INIT_LIST_HEAD(&dev->links.defer_sync);
dev->links.status = DL_DEV_NO_DRIVER;
}
EXPORT_SYMBOL_GPL(device_initialize);

9
drivers/base/dd.c
View file

@ -370,6 +370,13 @@ static void driver_bound(struct device *dev)
device_pm_check_callbacks(dev);
/*
* Reorder successfully probed devices to the end of the device list.
* This ensures that suspend/resume order matches probe order, which
* is usually what drivers rely on.
*/
device_pm_move_to_tail(dev);
/*
* Make sure the device is no longer in one of the deferred lists and
* kick off retrying all pending devices
@ -717,7 +724,7 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
*
* If the device has a parent, runtime-resume the parent before driver probing.
*/
int driver_probe_device(struct device_driver *drv, struct device *dev)
static int driver_probe_device(struct device_driver *drv, struct device *dev)
{
int ret = 0;

2
drivers/base/devres.c
View file

@ -149,7 +149,7 @@ void * __devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, int nid
EXPORT_SYMBOL_GPL(__devres_alloc_node);
#else
/**
* devres_alloc - Allocate device resource data
* devres_alloc_node - Allocate device resource data
* @release: Release function devres will be associated with
* @size: Allocation size
* @gfp: Allocation flags

2
drivers/base/firmware_loader/fallback.c
View file

@ -128,7 +128,7 @@ static ssize_t timeout_show(struct class *class, struct class_attribute *attr,
}
/**
* firmware_timeout_store() - set number of seconds to wait for firmware
* timeout_store() - set number of seconds to wait for firmware
* @class: device class pointer
* @attr: device attribute pointer
* @buf: buffer to scan for timeout value

474
drivers/base/platform.c
View file

@ -63,6 +63,21 @@ struct resource *platform_get_resource(struct platform_device *dev,
}
EXPORT_SYMBOL_GPL(platform_get_resource);
struct resource *platform_get_mem_or_io(struct platform_device *dev,
unsigned int num)
{
u32 i;
for (i = 0; i < dev->num_resources; i++) {
struct resource *r = &dev->resource[i];
if ((resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) && num-- == 0)
return r;
}
return NULL;
}
EXPORT_SYMBOL_GPL(platform_get_mem_or_io);
#ifdef CONFIG_HAS_IOMEM
/**
* devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a
@ -743,62 +758,6 @@ struct platform_device *platform_device_register_full(
}
EXPORT_SYMBOL_GPL(platform_device_register_full);
static int platform_drv_probe(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
int ret;
ret = of_clk_set_defaults(_dev->of_node, false);
if (ret < 0)
return ret;
ret = dev_pm_domain_attach(_dev, true);
if (ret)
goto out;
if (drv->probe) {
ret = drv->probe(dev);
if (ret)
dev_pm_domain_detach(_dev, true);
}
out:
if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
dev_warn(_dev, "probe deferral not supported\n");
ret = -ENXIO;
}
return ret;
}
static int platform_drv_probe_fail(struct device *_dev)
{
return -ENXIO;
}
static int platform_drv_remove(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
int ret = 0;
if (drv->remove)
ret = drv->remove(dev);
dev_pm_domain_detach(_dev, true);
return ret;
}
static void platform_drv_shutdown(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
if (drv->shutdown)
drv->shutdown(dev);
}
/**
* __platform_driver_register - register a driver for platform-level devices
* @drv: platform driver structure
@ -809,9 +768,6 @@ int __platform_driver_register(struct platform_driver *drv,
{
drv->driver.owner = owner;
drv->driver.bus = &platform_bus_type;
drv->driver.probe = platform_drv_probe;
drv->driver.remove = platform_drv_remove;
drv->driver.shutdown = platform_drv_shutdown;
return driver_register(&drv->driver);
}
@ -827,6 +783,11 @@ void platform_driver_unregister(struct platform_driver *drv)
}
EXPORT_SYMBOL_GPL(platform_driver_unregister);
static int platform_probe_fail(struct platform_device *pdev)
{
return -ENXIO;
}
/**
* __platform_driver_probe - register driver for non-hotpluggable device
* @drv: platform driver structure
@ -887,10 +848,9 @@ int __init_or_module __platform_driver_probe(struct platform_driver *drv,
* new devices fail.
*/
spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
drv->probe = NULL;
drv->probe = platform_probe_fail;
if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
retval = -ENODEV;
drv->driver.probe = platform_drv_probe_fail;
spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
if (code != retval)
@ -1017,129 +977,6 @@ void platform_unregister_drivers(struct platform_driver * const *drivers,
}
EXPORT_SYMBOL_GPL(platform_unregister_drivers);
/* modalias support enables more hands-off userspace setup:
* (a) environment variable lets new-style hotplug events work once system is
* fully running: "modprobe $MODALIAS"
* (b) sysfs attribute lets new-style coldplug recover from hotplug events
* mishandled before system is fully running: "modprobe $(cat modalias)"
*/
static ssize_t modalias_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
int len;
len = of_device_modalias(dev, buf, PAGE_SIZE);
if (len != -ENODEV)
return len;
len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
if (len != -ENODEV)
return len;
return sysfs_emit(buf, "platform:%s\n", pdev->name);
}
static DEVICE_ATTR_RO(modalias);
static ssize_t driver_override_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct platform_device *pdev = to_platform_device(dev);
char *driver_override, *old, *cp;
/* We need to keep extra room for a newline */
if (count >= (PAGE_SIZE - 1))
return -EINVAL;
driver_override = kstrndup(buf, count, GFP_KERNEL);
if (!driver_override)
return -ENOMEM;
cp = strchr(driver_override, '\n');
if (cp)
*cp = '\0';
device_lock(dev);
old = pdev->driver_override;
if (strlen(driver_override)) {
pdev->driver_override = driver_override;
} else {
kfree(driver_override);
pdev->driver_override = NULL;
}
device_unlock(dev);
kfree(old);
return count;
}
static ssize_t driver_override_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
ssize_t len;
device_lock(dev);
len = sysfs_emit(buf, "%s\n", pdev->driver_override);
device_unlock(dev);
return len;
}
static DEVICE_ATTR_RW(driver_override);
static ssize_t numa_node_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", dev_to_node(dev));
}
static DEVICE_ATTR_RO(numa_node);
static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a,
int n)
{
struct device *dev = container_of(kobj, typeof(*dev), kobj);
if (a == &dev_attr_numa_node.attr &&
dev_to_node(dev) == NUMA_NO_NODE)
return 0;
return a->mode;
}
static struct attribute *platform_dev_attrs[] = {
&dev_attr_modalias.attr,
&dev_attr_numa_node.attr,
&dev_attr_driver_override.attr,
NULL,
};
static struct attribute_group platform_dev_group = {
.attrs = platform_dev_attrs,
.is_visible = platform_dev_attrs_visible,
};
__ATTRIBUTE_GROUPS(platform_dev);
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct platform_device *pdev = to_platform_device(dev);
int rc;
/* Some devices have extra OF data and an OF-style MODALIAS */
rc = of_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;
rc = acpi_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;
add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
pdev->name);
return 0;
}
static const struct platform_device_id *platform_match_id(
const struct platform_device_id *id,
struct platform_device *pdev)
@ -1154,44 +991,6 @@ static const struct platform_device_id *platform_match_id(
return NULL;
}
/**
* platform_match - bind platform device to platform driver.
* @dev: device.
* @drv: driver.
*
* Platform device IDs are assumed to be encoded like this:
* "<name><instance>", where <name> is a short description of the type of
* device, like "pci" or "floppy", and <instance> is the enumerated
* instance of the device, like '0' or '42'. Driver IDs are simply
* "<name>". So, extract the <name> from the platform_device structure,
* and compare it against the name of the driver. Return whether they match
* or not.
*/
static int platform_match(struct device *dev, struct device_driver *drv)
{
struct platform_device *pdev = to_platform_device(dev);
struct platform_driver *pdrv = to_platform_driver(drv);
/* When driver_override is set, only bind to the matching driver */
if (pdev->driver_override)
return !strcmp(pdev->driver_override, drv->name);
/* Attempt an OF style match first */
if (of_driver_match_device(dev, drv))
return 1;
/* Then try ACPI style match */
if (acpi_driver_match_device(dev, drv))
return 1;
/* Then try to match against the id table */
if (pdrv->id_table)
return platform_match_id(pdrv->id_table, pdev) != NULL;
/* fall-back to driver name match */
return (strcmp(pdev->name, drv->name) == 0);
}
#ifdef CONFIG_PM_SLEEP
static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
@ -1336,6 +1135,234 @@ int platform_pm_restore(struct device *dev)
#endif /* CONFIG_HIBERNATE_CALLBACKS */
/* modalias support enables more hands-off userspace setup:
* (a) environment variable lets new-style hotplug events work once system is
* fully running: "modprobe $MODALIAS"
* (b) sysfs attribute lets new-style coldplug recover from hotplug events
* mishandled before system is fully running: "modprobe $(cat modalias)"
*/
static ssize_t modalias_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
int len;
len = of_device_modalias(dev, buf, PAGE_SIZE);
if (len != -ENODEV)
return len;
len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
if (len != -ENODEV)
return len;
return sysfs_emit(buf, "platform:%s\n", pdev->name);
}
static DEVICE_ATTR_RO(modalias);
static ssize_t numa_node_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", dev_to_node(dev));
}
static DEVICE_ATTR_RO(numa_node);
static ssize_t driver_override_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
ssize_t len;
device_lock(dev);
len = sysfs_emit(buf, "%s\n", pdev->driver_override);
device_unlock(dev);
return len;
}
static ssize_t driver_override_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct platform_device *pdev = to_platform_device(dev);
char *driver_override, *old, *cp;
/* We need to keep extra room for a newline */
if (count >= (PAGE_SIZE - 1))
return -EINVAL;
driver_override = kstrndup(buf, count, GFP_KERNEL);
if (!driver_override)
return -ENOMEM;
cp = strchr(driver_override, '\n');
if (cp)
*cp = '\0';
device_lock(dev);
old = pdev->driver_override;
if (strlen(driver_override)) {
pdev->driver_override = driver_override;
} else {
kfree(driver_override);
pdev->driver_override = NULL;
}
device_unlock(dev);
kfree(old);
return count;
}
static DEVICE_ATTR_RW(driver_override);
static struct attribute *platform_dev_attrs[] = {
&dev_attr_modalias.attr,
&dev_attr_numa_node.attr,
&dev_attr_driver_override.attr,
NULL,
};
static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a,
int n)
{
struct device *dev = container_of(kobj, typeof(*dev), kobj);
if (a == &dev_attr_numa_node.attr &&
dev_to_node(dev) == NUMA_NO_NODE)
return 0;
return a->mode;
}
static struct attribute_group platform_dev_group = {
.attrs = platform_dev_attrs,
.is_visible = platform_dev_attrs_visible,
};
__ATTRIBUTE_GROUPS(platform_dev);
/**
* platform_match - bind platform device to platform driver.
* @dev: device.
* @drv: driver.
*
* Platform device IDs are assumed to be encoded like this:
* "<name><instance>", where <name> is a short description of the type of
* device, like "pci" or "floppy", and <instance> is the enumerated
* instance of the device, like '0' or '42'. Driver IDs are simply
* "<name>". So, extract the <name> from the platform_device structure,
* and compare it against the name of the driver. Return whether they match
* or not.
*/
static int platform_match(struct device *dev, struct device_driver *drv)
{
struct platform_device *pdev = to_platform_device(dev);
struct platform_driver *pdrv = to_platform_driver(drv);
/* When driver_override is set, only bind to the matching driver */
if (pdev->driver_override)
return !strcmp(pdev->driver_override, drv->name);
/* Attempt an OF style match first */
if (of_driver_match_device(dev, drv))
return 1;
/* Then try ACPI style match */
if (acpi_driver_match_device(dev, drv))
return 1;
/* Then try to match against the id table */
if (pdrv->id_table)
return platform_match_id(pdrv->id_table, pdev) != NULL;
/* fall-back to driver name match */
return (strcmp(pdev->name, drv->name) == 0);
}
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct platform_device *pdev = to_platform_device(dev);
int rc;
/* Some devices have extra OF data and an OF-style MODALIAS */
rc = of_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;
rc = acpi_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;
add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
pdev->name);
return 0;
}
static int platform_probe(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
int ret;
/*
* A driver registered using platform_driver_probe() cannot be bound
* again later because the probe function usually lives in __init code
* and so is gone. For these drivers .probe is set to
* platform_probe_fail in __platform_driver_probe(). Don't even prepare
* clocks and PM domains for these to match the traditional behaviour.
*/
if (unlikely(drv->probe == platform_probe_fail))
return -ENXIO;
ret = of_clk_set_defaults(_dev->of_node, false);
if (ret < 0)
return ret;
ret = dev_pm_domain_attach(_dev, true);
if (ret)
goto out;
if (drv->probe) {
ret = drv->probe(dev);
if (ret)
dev_pm_domain_detach(_dev, true);
}
out:
if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
dev_warn(_dev, "probe deferral not supported\n");
ret = -ENXIO;
}
return ret;
}
static int platform_remove(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
int ret = 0;
if (drv->remove)
ret = drv->remove(dev);
dev_pm_domain_detach(_dev, true);
return ret;
}
static void platform_shutdown(struct device *_dev)
{
struct platform_device *dev = to_platform_device(_dev);
struct platform_driver *drv;
if (!_dev->driver)
return;
drv = to_platform_driver(_dev->driver);
if (drv->shutdown)
drv->shutdown(dev);
}
int platform_dma_configure(struct device *dev)
{
enum dev_dma_attr attr;
@ -1362,6 +1389,9 @@ struct bus_type platform_bus_type = {
.dev_groups = platform_dev_groups,
.match = platform_match,
.uevent = platform_uevent,
.probe = platform_probe,
.remove = platform_remove,
.shutdown = platform_shutdown,
.dma_configure = platform_dma_configure,
.pm = &platform_dev_pm_ops,
};

52
drivers/base/property.c
View file

@ -614,6 +614,31 @@ struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
}
EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
/**
* fwnode_get_next_parent_dev - Find device of closest ancestor fwnode
* @fwnode: firmware node
*
* Given a firmware node (@fwnode), this function finds its closest ancestor
* firmware node that has a corresponding struct device and returns that struct
* device.
*
* The caller of this function is expected to call put_device() on the returned
* device when they are done.
*/
struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode)
{
struct device *dev = NULL;
fwnode_handle_get(fwnode);
do {
fwnode = fwnode_get_next_parent(fwnode);
if (fwnode)
dev = get_dev_from_fwnode(fwnode);
} while (fwnode && !dev);
fwnode_handle_put(fwnode);
return dev;
}
/**
* fwnode_count_parents - Return the number of parents a node has
* @fwnode: The node the parents of which are to be counted
@ -660,6 +685,33 @@ struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
/**
* fwnode_is_ancestor_of - Test if @test_ancestor is ancestor of @test_child
* @test_ancestor: Firmware which is tested for being an ancestor
* @test_child: Firmware which is tested for being the child
*
* A node is considered an ancestor of itself too.
*
* Returns true if @test_ancestor is an ancestor of @test_child.
* Otherwise, returns false.
*/
bool fwnode_is_ancestor_of(struct fwnode_handle *test_ancestor,
struct fwnode_handle *test_child)
{
if (!test_ancestor)
return false;
fwnode_handle_get(test_child);
while (test_child) {
if (test_child == test_ancestor) {
fwnode_handle_put(test_child);
return true;
}
test_child = fwnode_get_next_parent(test_child);
}
return false;
}
/**
* fwnode_get_next_child_node - Return the next child node handle for a node
* @fwnode: Firmware node to find the next child node for.

2
drivers/base/soc.c
View file

@ -168,7 +168,7 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
}
EXPORT_SYMBOL_GPL(soc_device_register);
/* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
/* Ensure soc_dev->attr is freed after calling soc_device_unregister. */
void soc_device_unregister(struct soc_device *soc_dev)
{
device_unregister(&soc_dev->dev);

2
drivers/base/swnode.c
View file

@ -653,7 +653,7 @@ swnode_register(const struct software_node *node, struct swnode *parent,
swnode->parent = parent;
swnode->allocated = allocated;
swnode->kobj.kset = swnode_kset;
swnode->fwnode.ops = &software_node_ops;
fwnode_init(&swnode->fwnode, &software_node_ops);
ida_init(&swnode->child_ids);
INIT_LIST_HEAD(&swnode->entry);

32
drivers/firmware/efi/efi-init.c
View file

@ -316,11 +316,9 @@ static struct device_node *find_pci_overlap_node(void)
* resource reservation conflict on the memory window that the efifb
* framebuffer steals from the PCIe host bridge.
*/
static int efifb_add_links(const struct fwnode_handle *fwnode,
struct device *dev)
static int efifb_add_links(struct fwnode_handle *fwnode)
{
struct device_node *sup_np;
struct device *sup_dev;
sup_np = find_pci_overlap_node();
@ -331,27 +329,9 @@ static int efifb_add_links(const struct fwnode_handle *fwnode,
if (!sup_np)
return 0;
sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
fwnode_link_add(fwnode, of_fwnode_handle(sup_np));
of_node_put(sup_np);
/*
* Return -ENODEV if the PCI graphics controller device hasn't been
* registered yet. This ensures that efifb isn't allowed to probe
* and this function is retried again when new devices are
* registered.
*/
if (!sup_dev)
return -ENODEV;
/*
* If this fails, retrying this function at a later point won't
* change anything. So, don't return an error after this.
*/
if (!device_link_add(dev, sup_dev, fw_devlink_get_flags()))
dev_warn(dev, "device_link_add() failed\n");
put_device(sup_dev);
return 0;
}
@ -359,9 +339,7 @@ static const struct fwnode_operations efifb_fwnode_ops = {
.add_links = efifb_add_links,
};
static struct fwnode_handle efifb_fwnode = {
.ops = &efifb_fwnode_ops,
};
static struct fwnode_handle efifb_fwnode;
static int __init register_gop_device(void)
{
@ -375,8 +353,10 @@ static int __init register_gop_device(void)
if (!pd)
return -ENOMEM;
if (IS_ENABLED(CONFIG_PCI))
if (IS_ENABLED(CONFIG_PCI)) {
fwnode_init(&efifb_fwnode, &efifb_fwnode_ops);
pd->dev.fwnode = &efifb_fwnode;
}
err = platform_device_add_data(pd, &screen_info, sizeof(screen_info));
if (err)

134
drivers/misc/pvpanic.c
View file

@ -8,14 +8,14 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <uapi/misc/pvpanic.h>
static void __iomem *base;
@ -49,101 +49,16 @@ static struct notifier_block pvpanic_panic_nb = {
.priority = 1, /* let this called before broken drm_fb_helper */
};
#ifdef CONFIG_ACPI
static int pvpanic_add(struct acpi_device *device);
static int pvpanic_remove(struct acpi_device *device);
static const struct acpi_device_id pvpanic_device_ids[] = {
{ "QEMU0001", 0 },
{ "", 0 }
};
MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
static struct acpi_driver pvpanic_driver = {
.name = "pvpanic",
.class = "QEMU",
.ids = pvpanic_device_ids,
.ops = {
.add = pvpanic_add,
.remove = pvpanic_remove,
},
.owner = THIS_MODULE,
};
static acpi_status
pvpanic_walk_resources(struct acpi_resource *res, void *context)
{
struct resource r;
if (acpi_dev_resource_io(res, &r)) {
#ifdef CONFIG_HAS_IOPORT_MAP
base = ioport_map(r.start, resource_size(&r));
return AE_OK;
#else
return AE_ERROR;
#endif
} else if (acpi_dev_resource_memory(res, &r)) {
base = ioremap(r.start, resource_size(&r));
return AE_OK;
}
return AE_ERROR;
}
static int pvpanic_add(struct acpi_device *device)
{
int ret;
ret = acpi_bus_get_status(device);
if (ret < 0)
return ret;
if (!device->status.enabled || !device->status.functional)
return -ENODEV;
acpi_walk_resources(device->handle, METHOD_NAME__CRS,
pvpanic_walk_resources, NULL);
if (!base)
return -ENODEV;
atomic_notifier_chain_register(&panic_notifier_list,
&pvpanic_panic_nb);
return 0;
}
static int pvpanic_remove(struct acpi_device *device)
{
atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
iounmap(base);
return 0;
}
static int pvpanic_register_acpi_driver(void)
{
return acpi_bus_register_driver(&pvpanic_driver);
}
static void pvpanic_unregister_acpi_driver(void)
{
acpi_bus_unregister_driver(&pvpanic_driver);
}
#else
static int pvpanic_register_acpi_driver(void)
{
return -ENODEV;
}
static void pvpanic_unregister_acpi_driver(void) {}
#endif
static int pvpanic_mmio_probe(struct platform_device *pdev)
{
base = devm_platform_ioremap_resource(pdev, 0);
struct device *dev = &pdev->dev;
struct resource *res;
res = platform_get_mem_or_io(pdev, 0);
if (res && resource_type(res) == IORESOURCE_IO)
base = devm_ioport_map(dev, res->start, resource_size(res));
else
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
@ -167,30 +82,19 @@ static const struct of_device_id pvpanic_mmio_match[] = {
{}
};
static const struct acpi_device_id pvpanic_device_ids[] = {
{ "QEMU0001", 0 },
{ "", 0 }
};
MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
static struct platform_driver pvpanic_mmio_driver = {
.driver = {
.name = "pvpanic-mmio",
.of_match_table = pvpanic_mmio_match,
.acpi_match_table = pvpanic_device_ids,
},
.probe = pvpanic_mmio_probe,
.remove = pvpanic_mmio_remove,
};
static int __init pvpanic_mmio_init(void)
{
if (acpi_disabled)
return platform_driver_register(&pvpanic_mmio_driver);
else
return pvpanic_register_acpi_driver();
}
static void __exit pvpanic_mmio_exit(void)
{
if (acpi_disabled)
platform_driver_unregister(&pvpanic_mmio_driver);
else
pvpanic_unregister_acpi_driver();
}
module_init(pvpanic_mmio_init);
module_exit(pvpanic_mmio_exit);
module_platform_driver(pvpanic_mmio_driver);

1
drivers/of/dynamic.c
View file

@ -356,6 +356,7 @@ void of_node_release(struct kobject *kobj)
property_list_free(node->properties);
property_list_free(node->deadprops);
fwnode_links_purge(of_fwnode_handle(node));
kfree(node->full_name);
kfree(node->data);

2
drivers/of/platform.c
View file

@ -538,9 +538,7 @@ static int __init of_platform_default_populate_init(void)
}
/* Populate everything else. */
fw_devlink_pause();
of_platform_default_populate(NULL, NULL, NULL);
fw_devlink_resume();
return 0;
}

149
drivers/of/property.c
View file

@ -1038,33 +1038,9 @@ static bool of_is_ancestor_of(struct device_node *test_ancestor,
}
/**
* of_get_next_parent_dev - Add device link to supplier from supplier phandle
* @np: device tree node
*
* Given a device tree node (@np), this function finds its closest ancestor
* device tree node that has a corresponding struct device.
*
* The caller of this function is expected to call put_device() on the returned
* device when they are done.
*/
static struct device *of_get_next_parent_dev(struct device_node *np)
{
struct device *dev = NULL;
of_node_get(np);
do {
np = of_get_next_parent(np);
if (np)
dev = get_dev_from_fwnode(&np->fwnode);
} while (np && !dev);
of_node_put(np);
return dev;
}
/**
* of_link_to_phandle - Add device link to supplier from supplier phandle
* @dev: consumer device
* @sup_np: phandle to supplier device tree node
* of_link_to_phandle - Add fwnode link to supplier from supplier phandle
* @con_np: consumer device tree node
* @sup_np: supplier device tree node
*
* Given a phandle to a supplier device tree node (@sup_np), this function
* finds the device that owns the supplier device tree node and creates a
@ -1074,16 +1050,14 @@ static struct device *of_get_next_parent_dev(struct device_node *np)
* cases, it returns an error.
*
* Returns:
* - 0 if link successfully created to supplier
* - -EAGAIN if linking to the supplier should be reattempted
* - 0 if fwnode link successfully created to supplier
* - -EINVAL if the supplier link is invalid and should not be created
* - -ENODEV if there is no device that corresponds to the supplier phandle
* - -ENODEV if struct device will never be create for supplier
*/
static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
u32 dl_flags)
static int of_link_to_phandle(struct device_node *con_np,
struct device_node *sup_np)
{
struct device *sup_dev, *sup_par_dev;
int ret = 0;
struct device *sup_dev;
struct device_node *tmp_np = sup_np;
of_node_get(sup_np);
@ -1106,7 +1080,8 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
}
if (!sup_np) {
dev_dbg(dev, "Not linking to %pOFP - No device\n", tmp_np);
pr_debug("Not linking %pOFP to %pOFP - No device\n",
con_np, tmp_np);
return -ENODEV;
}
@ -1115,53 +1090,30 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
* descendant nodes. By definition, a child node can't be a functional
* dependency for the parent node.
*/
if (of_is_ancestor_of(dev->of_node, sup_np)) {
dev_dbg(dev, "Not linking to %pOFP - is descendant\n", sup_np);
if (of_is_ancestor_of(con_np, sup_np)) {
pr_debug("Not linking %pOFP to %pOFP - is descendant\n",
con_np, sup_np);
of_node_put(sup_np);
return -EINVAL;
}
/*
* Don't create links to "early devices" that won't have struct devices
* created for them.
*/
sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
if (!sup_dev && of_node_check_flag(sup_np, OF_POPULATED)) {
/* Early device without struct device. */
dev_dbg(dev, "Not linking to %pOFP - No struct device\n",
sup_np);
pr_debug("Not linking %pOFP to %pOFP - No struct device\n",
con_np, sup_np);
of_node_put(sup_np);
return -ENODEV;
} else if (!sup_dev) {
/*
* DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports
* cycles. So cycle detection isn't necessary and shouldn't be
* done.
*/
if (dl_flags & DL_FLAG_SYNC_STATE_ONLY) {
of_node_put(sup_np);
return -EAGAIN;
}
sup_par_dev = of_get_next_parent_dev(sup_np);
if (sup_par_dev && device_is_dependent(dev, sup_par_dev)) {
/* Cyclic dependency detected, don't try to link */
dev_dbg(dev, "Not linking to %pOFP - cycle detected\n",
sup_np);
ret = -EINVAL;
} else {
/*
* Can't check for cycles or no cycles. So let's try
* again later.
*/
ret = -EAGAIN;
}
of_node_put(sup_np);
put_device(sup_par_dev);
return ret;
}
of_node_put(sup_np);
if (!device_link_add(dev, sup_dev, dl_flags))
ret = -EINVAL;
put_device(sup_dev);
return ret;
fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np));
of_node_put(sup_np);
return 0;
}
/**
@ -1361,37 +1313,29 @@ static const struct supplier_bindings of_supplier_bindings[] = {
* that list phandles to suppliers. If @prop_name isn't one, this function
* doesn't do anything.
*
* If @prop_name is one, this function attempts to create device links from the
* consumer device @dev to all the devices of the suppliers listed in
* @prop_name.
* If @prop_name is one, this function attempts to create fwnode links from the
* consumer device tree node @con_np to all the suppliers device tree nodes
* listed in @prop_name.
*
* Any failed attempt to create a device link will NOT result in an immediate
* Any failed attempt to create a fwnode link will NOT result in an immediate
* return. of_link_property() must create links to all the available supplier
* devices even when attempts to create a link to one or more suppliers fail.
* device tree nodes even when attempts to create a link to one or more
* suppliers fail.
*/
static int of_link_property(struct device *dev, struct device_node *con_np,
const char *prop_name)
static int of_link_property(struct device_node *con_np, const char *prop_name)
{
struct device_node *phandle;
const struct supplier_bindings *s = of_supplier_bindings;
unsigned int i = 0;
bool matched = false;
int ret = 0;
u32 dl_flags;
if (dev->of_node == con_np)
dl_flags = fw_devlink_get_flags();
else
dl_flags = DL_FLAG_SYNC_STATE_ONLY;
/* Do not stop at first failed link, link all available suppliers. */
while (!matched && s->parse_prop) {
while ((phandle = s->parse_prop(con_np, prop_name, i))) {
matched = true;
i++;
if (of_link_to_phandle(dev, phandle, dl_flags)
== -EAGAIN)
ret = -EAGAIN;
of_link_to_phandle(con_np, phandle);
of_node_put(phandle);
}
s++;
@ -1399,31 +1343,18 @@ static int of_link_property(struct device *dev, struct device_node *con_np,
return ret;
}
static int of_link_to_suppliers(struct device *dev,
struct device_node *con_np)
static int of_fwnode_add_links(struct fwnode_handle *fwnode)
{
struct device_node *child;
struct property *p;
int ret = 0;
struct device_node *con_np = to_of_node(fwnode);
if (!con_np)
return -EINVAL;
for_each_property_of_node(con_np, p)
if (of_link_property(dev, con_np, p->name))
ret = -ENODEV;
of_link_property(con_np, p->name);
for_each_available_child_of_node(con_np, child)
if (of_link_to_suppliers(dev, child) && !ret)
ret = -EAGAIN;
return ret;
}
static int of_fwnode_add_links(const struct fwnode_handle *fwnode,
struct device *dev)
{
if (unlikely(!is_of_node(fwnode)))
return 0;
return of_link_to_suppliers(dev, to_of_node(fwnode));
return 0;
}
const struct fwnode_operations of_fwnode_ops = {

20
drivers/usb/host/sl811-hcd.c
View file

@ -1614,12 +1614,18 @@ sl811h_probe(struct platform_device *dev)
void __iomem *addr_reg;
void __iomem *data_reg;
int retval;
u8 tmp, ioaddr = 0;
u8 tmp, ioaddr;
unsigned long irqflags;
if (usb_disabled())
return -ENODEV;
/* the chip may be wired for either kind of addressing */
addr = platform_get_mem_or_io(dev, 0);
data = platform_get_mem_or_io(dev, 1);
if (!addr || !data || resource_type(addr) != resource_type(data))
return -ENODEV;
/* basic sanity checks first. board-specific init logic should
* have initialized these three resources and probably board
* specific platform_data. we don't probe for IRQs, and do only
@ -1632,16 +1638,8 @@ sl811h_probe(struct platform_device *dev)
irq = ires->start;
irqflags = ires->flags & IRQF_TRIGGER_MASK;
/* the chip may be wired for either kind of addressing */
addr = platform_get_resource(dev, IORESOURCE_MEM, 0);
data = platform_get_resource(dev, IORESOURCE_MEM, 1);
retval = -EBUSY;
if (!addr || !data) {
addr = platform_get_resource(dev, IORESOURCE_IO, 0);
data = platform_get_resource(dev, IORESOURCE_IO, 1);
if (!addr || !data)
return -ENODEV;
ioaddr = 1;
ioaddr = resource_type(addr) == IORESOURCE_IO;
if (ioaddr) {
/*
* NOTE: 64-bit resource->start is getting truncated
* to avoid compiler warning, assuming that ->start

13
drivers/vfio/platform/vfio_platform.c
View file

@ -25,19 +25,8 @@ static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
int num)
{
struct platform_device *dev = (struct platform_device *) vdev->opaque;
int i;
for (i = 0; i < dev->num_resources; i++) {
struct resource *r = &dev->resource[i];
if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
if (!num)
return r;
num--;
}
}
return NULL;
return platform_get_mem_or_io(dev, num);
}
static int get_platform_irq(struct vfio_platform_device *vdev, int i)

5
fs/kernfs/dir.c
View file

@ -604,8 +604,7 @@ const struct dentry_operations kernfs_dops = {
*/
struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry)
{
if (dentry->d_sb->s_op == &kernfs_sops &&
!d_really_is_negative(dentry))
if (dentry->d_sb->s_op == &kernfs_sops)
return kernfs_dentry_node(dentry);
return NULL;
}
@ -1599,7 +1598,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
return error;
}
/* Relationship between s_mode and the DT_xxx types */
/* Relationship between mode and the DT_xxx types */
static inline unsigned char dt_type(struct kernfs_node *kn)
{
return (kn->mode >> 12) & 15;

2
include/linux/acpi.h
View file

@ -55,7 +55,7 @@ static inline struct fwnode_handle *acpi_alloc_fwnode_static(void)
if (!fwnode)
return NULL;
fwnode->ops = &acpi_static_fwnode_ops;
fwnode_init(fwnode, &acpi_static_fwnode_ops);
return fwnode;
}

10
include/linux/device.h
View file

@ -351,19 +351,13 @@ enum dl_dev_state {
* struct dev_links_info - Device data related to device links.
* @suppliers: List of links to supplier devices.
* @consumers: List of links to consumer devices.
* @needs_suppliers: Hook to global list of devices waiting for suppliers.
* @defer_hook: Hook to global list of devices that have deferred sync_state or
* deferred fw_devlink.
* @need_for_probe: If needs_suppliers is on a list, this indicates if the
* suppliers are needed for probe or not.
* @defer_sync: Hook to global list of devices that have deferred sync_state.
* @status: Driver status information.
*/
struct dev_links_info {
struct list_head suppliers;
struct list_head consumers;
struct list_head needs_suppliers;
struct list_head defer_hook;
bool need_for_probe;
struct list_head defer_sync;
enum dl_dev_state status;
};

14
include/linux/device/class.h
View file

@ -256,6 +256,20 @@ extern void class_destroy(struct class *cls);
/* This is a #define to keep the compiler from merging different
* instances of the __key variable */
/**
* class_create - create a struct class structure
* @owner: pointer to the module that is to "own" this struct class
* @name: pointer to a string for the name of this class.
*
* This is used to create a struct class pointer that can then be used
* in calls to device_create().
*
* Returns &struct class pointer on success, or ERR_PTR() on error.
*
* Note, the pointer created here is to be destroyed when finished by
* making a call to class_destroy().
*/
#define class_create(owner, name) \
({ \
static struct lock_class_key __key; \

73
include/linux/fwnode.h
View file

@ -10,14 +10,32 @@
#define _LINUX_FWNODE_H_
#include <linux/types.h>
#include <linux/list.h>
struct fwnode_operations;
struct device;
/*
* fwnode link flags
*
* LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
*/
#define FWNODE_FLAG_LINKS_ADDED BIT(0)
struct fwnode_handle {
struct fwnode_handle *secondary;
const struct fwnode_operations *ops;
struct device *dev;
struct list_head suppliers;
struct list_head consumers;
u8 flags;
};
struct fwnode_link {
struct fwnode_handle *supplier;
struct list_head s_hook;
struct fwnode_handle *consumer;
struct list_head c_hook;
};
/**
@ -68,44 +86,8 @@ struct fwnode_reference_args {
* endpoint node.
* @graph_get_port_parent: Return the parent node of a port node.
* @graph_parse_endpoint: Parse endpoint for port and endpoint id.
* @add_links: Called after the device corresponding to the fwnode is added
* using device_add(). The function is expected to create device
* links to all the suppliers of the device that are available at
* the time this function is called. The function must NOT stop
* at the first failed device link if other unlinked supplier
* devices are present in the system. This is necessary for the
* driver/bus sync_state() callbacks to work correctly.
*
* For example, say Device-C depends on suppliers Device-S1 and
* Device-S2 and the dependency is listed in that order in the
* firmware. Say, S1 gets populated from the firmware after
* late_initcall_sync(). Say S2 is populated and probed way
* before that in device_initcall(). When C is populated, if this
* add_links() function doesn't continue past a "failed linking to
* S1" and continue linking C to S2, then S2 will get a
* sync_state() callback before C is probed. This is because from
* the perspective of S2, C was never a consumer when its
* sync_state() evaluation is done. To avoid this, the add_links()
* function has to go through all available suppliers of the
* device (that corresponds to this fwnode) and link to them
* before returning.
*
* If some suppliers are not yet available (indicated by an error
* return value), this function will be called again when other
* devices are added to allow creating device links to any newly
* available suppliers.
*
* Return 0 if device links have been successfully created to all
* the known suppliers of this device or if the supplier
* information is not known.
*
* Return -ENODEV if the suppliers needed for probing this device
* have not been registered yet (because device links can only be
* created to devices registered with the driver core).
*
* Return -EAGAIN if some of the suppliers of this device have not
* been registered yet, but none of those suppliers are necessary
* for probing the device.
* @add_links: Create fwnode links to all the suppliers of the fwnode. Return
* zero on success, a negative error code otherwise.
*/
struct fwnode_operations {
struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
@ -145,8 +127,7 @@ struct fwnode_operations {
(*graph_get_port_parent)(struct fwnode_handle *fwnode);
int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
struct fwnode_endpoint *endpoint);
int (*add_links)(const struct fwnode_handle *fwnode,
struct device *dev);
int (*add_links)(struct fwnode_handle *fwnode);
};
#define fwnode_has_op(fwnode, op) \
@ -170,8 +151,16 @@ struct fwnode_operations {
} while (false)
#define get_dev_from_fwnode(fwnode) get_device((fwnode)->dev)
static inline void fwnode_init(struct fwnode_handle *fwnode,
const struct fwnode_operations *ops)
{
fwnode->ops = ops;
INIT_LIST_HEAD(&fwnode->consumers);
INIT_LIST_HEAD(&fwnode->suppliers);
}
extern u32 fw_devlink_get_flags(void);
void fw_devlink_pause(void);
void fw_devlink_resume(void);
int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
void fwnode_links_purge(struct fwnode_handle *fwnode);
#endif

2
include/linux/kernfs.h
View file

@ -116,7 +116,7 @@ struct kernfs_elem_attr {
* kernfs node is represented by single kernfs_node. Most fields are
* private to kernfs and shouldn't be accessed directly by kernfs users.
*
* As long as s_count reference is held, the kernfs_node itself is
* As long as count reference is held, the kernfs_node itself is
* accessible. Dereferencing elem or any other outer entity requires
* active reference.
*/

3
include/linux/of.h
View file

@ -108,7 +108,7 @@ static inline void of_node_init(struct device_node *node)
#if defined(CONFIG_OF_KOBJ)
kobject_init(&node->kobj, &of_node_ktype);
#endif
node->fwnode.ops = &of_fwnode_ops;
fwnode_init(&node->fwnode, &of_fwnode_ops);
}
#if defined(CONFIG_OF_KOBJ)
@ -1307,6 +1307,7 @@ static inline int of_get_available_child_count(const struct device_node *np)
#define _OF_DECLARE(table, name, compat, fn, fn_type) \
static const struct of_device_id __of_table_##name \
__used __section("__" #table "_of_table") \
__aligned(__alignof__(struct of_device_id)) \
= { .compatible = compat, \
.data = (fn == (fn_type)NULL) ? fn : fn }
#else

3
include/linux/platform_device.h
View file

@ -52,6 +52,9 @@ extern struct device platform_bus;
extern struct resource *platform_get_resource(struct platform_device *,
unsigned int, unsigned int);
extern struct resource *platform_get_mem_or_io(struct platform_device *,
unsigned int);
extern struct device *
platform_find_device_by_driver(struct device *start,
const struct device_driver *drv);

3
include/linux/property.h
View file

@ -85,9 +85,12 @@ const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_next_parent(
struct fwnode_handle *fwnode);
struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode);
unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
unsigned int depth);
bool fwnode_is_ancestor_of(struct fwnode_handle *test_ancestor,
struct fwnode_handle *test_child);
struct fwnode_handle *fwnode_get_next_child_node(
const struct fwnode_handle *fwnode, struct fwnode_handle *child);
struct fwnode_handle *fwnode_get_next_available_child_node(

2
kernel/irq/irqdomain.c
View file

@ -100,7 +100,7 @@ struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
fwid->type = type;
fwid->name = n;
fwid->pa = pa;
fwid->fwnode.ops = &irqchip_fwnode_ops;
fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
return &fwid->fwnode;
}
EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);

9
lib/dynamic_debug.c
View file

@ -561,9 +561,14 @@ static int ddebug_exec_queries(char *query, const char *modname)
int dynamic_debug_exec_queries(const char *query, const char *modname)
{
int rc;
char *qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
char *qry; /* writable copy of query */
if (!query)
if (!query) {
pr_err("non-null query/command string expected\n");
return -EINVAL;
}
qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
if (!qry)
return -ENOMEM;
rc = ddebug_exec_queries(qry, modname);