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drm: Add DRM-managed mutex_init()

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Add drmm_mutex_init(), a helper that provides managed mutex cleanup. The
mutex will be destroyed with the final reference of the DRM device.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220502142514.2174-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2022-05-02 16:25:12 +02:00
parent cce6bedb38
commit e13f13e039
2 changed files with 30 additions and 0 deletions
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27
drivers/gpu/drm/drm_managed.c
View file

@ -8,6 +8,7 @@
#include <drm/drm_managed.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@ -262,3 +263,29 @@ void drmm_kfree(struct drm_device *dev, void *data)
free_dr(dr_match);
}
EXPORT_SYMBOL(drmm_kfree);
static void drmm_mutex_release(struct drm_device *dev, void *res)
{
struct mutex *lock = res;
mutex_destroy(lock);
}
/**
* drmm_mutex_init - &drm_device-managed mutex_init()
* @dev: DRM device
* @lock: lock to be initialized
*
* Returns:
* 0 on success, or a negative errno code otherwise.
*
* This is a &drm_device-managed version of mutex_init(). The initialized
* lock is automatically destroyed on the final drm_dev_put().
*/
int drmm_mutex_init(struct drm_device *dev, struct mutex *lock)
{
mutex_init(lock);
return drmm_add_action_or_reset(dev, drmm_mutex_release, lock);
}
EXPORT_SYMBOL(drmm_mutex_init);

3
include/drm/drm_managed.h
View file

@ -8,6 +8,7 @@
#include <linux/types.h>
struct drm_device;
struct mutex;
typedef void (*drmres_release_t)(struct drm_device *dev, void *res);
@ -104,4 +105,6 @@ char *drmm_kstrdup(struct drm_device *dev, const char *s, gfp_t gfp);
void drmm_kfree(struct drm_device *dev, void *data);
int drmm_mutex_init(struct drm_device *dev, struct mutex *lock);
#endif