diff --git a/drivers/base/base.h b/drivers/base/base.h index 40fb069a8a7e..91cfb8405abd 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -93,6 +93,7 @@ struct device_private { struct klist_node knode_class; struct list_head deferred_probe; struct device_driver *async_driver; + char *deferred_probe_reason; struct device *device; u8 dead:1; }; @@ -134,6 +135,8 @@ extern void device_release_driver_internal(struct device *dev, 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); static inline int driver_match_device(struct device_driver *drv, struct device *dev) { diff --git a/drivers/base/core.c b/drivers/base/core.c index 1606488ed741..778c7a435cbd 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -4213,6 +4213,8 @@ define_dev_printk_level(_dev_info, KERN_INFO); * This helper implements common pattern present in probe functions for error * checking: print debug or error message depending if the error value is * -EPROBE_DEFER and propagate error upwards. + * In case of -EPROBE_DEFER it sets also defer probe reason, which can be + * checked later by reading devices_deferred debugfs attribute. * It replaces code sequence: * if (err != -EPROBE_DEFER) * dev_err(dev, ...); @@ -4234,10 +4236,12 @@ int dev_err_probe(const struct device *dev, int err, const char *fmt, ...) vaf.fmt = fmt; vaf.va = &args; - if (err != -EPROBE_DEFER) + if (err != -EPROBE_DEFER) { dev_err(dev, "error %d: %pV", err, &vaf); - else + } else { + device_set_deferred_probe_reason(dev, &vaf); dev_dbg(dev, "error %d: %pV", err, &vaf); + } va_end(args); diff --git a/drivers/base/dd.c b/drivers/base/dd.c index b29faa24eef8..857b0a928e8d 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -27,6 +27,7 @@ #include #include #include +#include #include "base.h" #include "power/power.h" @@ -136,6 +137,8 @@ void driver_deferred_probe_del(struct device *dev) if (!list_empty(&dev->p->deferred_probe)) { dev_dbg(dev, "Removed from deferred list\n"); list_del_init(&dev->p->deferred_probe); + kfree(dev->p->deferred_probe_reason); + dev->p->deferred_probe_reason = NULL; } mutex_unlock(&deferred_probe_mutex); } @@ -206,6 +209,23 @@ void device_unblock_probing(void) driver_deferred_probe_trigger(); } +/** + * device_set_deferred_probe_reason() - Set defer probe reason message for device + * @dev: the pointer to the struct device + * @vaf: the pointer to va_format structure with message + */ +void device_set_deferred_probe_reason(const struct device *dev, struct va_format *vaf) +{ + const char *drv = dev_driver_string(dev); + + mutex_lock(&deferred_probe_mutex); + + kfree(dev->p->deferred_probe_reason); + dev->p->deferred_probe_reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf); + + mutex_unlock(&deferred_probe_mutex); +} + /* * deferred_devs_show() - Show the devices in the deferred probe pending list. */ @@ -216,7 +236,8 @@ static int deferred_devs_show(struct seq_file *s, void *data) mutex_lock(&deferred_probe_mutex); list_for_each_entry(curr, &deferred_probe_pending_list, deferred_probe) - seq_printf(s, "%s\n", dev_name(curr->device)); + seq_printf(s, "%s\t%s", dev_name(curr->device), + curr->device->p->deferred_probe_reason ?: "\n"); mutex_unlock(&deferred_probe_mutex);