Commit e13f13e0 authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

drm: Add DRM-managed mutex_init() 



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: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarJocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220502142514.2174-2-tzimmermann@suse.de
parent cce6bedb

drivers/gpu/drm/drm_managed.c

+27 −0
Original line number Diff line number Diff line
@@ -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);

include/drm/drm_managed.h

+3 −0
Original line number Diff line number Diff line
@@ -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