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Commit d926d0e4 authored by Mark Brown's avatar Mark Brown Committed by Greg Kroah-Hartman
Browse files

devres: Add devres_release() 



APIs using devres frequently want to implement a "remove and free the
resource" operation so it seems sensible that they should be able to
just have devres do the freeing for them since that's a big part of what
devres is all about.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 698cd2dd

drivers/base/devres.c

+31 −0
Original line number Diff line number Diff line
@@ -330,6 +330,37 @@ int devres_destroy(struct device *dev, dr_release_t release, 
}

EXPORT_SYMBOL_GPL(devres_destroy);





/**

 * devres_release - Find a device resource and destroy it, calling release

 * @dev: Device to find resource from

 * @release: Look for resources associated with this release function

 * @match: Match function (optional)

 * @match_data: Data for the match function

 *

 * Find the latest devres of @dev associated with @release and for

 * which @match returns 1.  If @match is NULL, it's considered to

 * match all.  If found, the resource is removed atomically, the

 * release function called and the resource freed.

 *

 * RETURNS:

 * 0 if devres is found and freed, -ENOENT if not found.

 */

int devres_release(struct device *dev, dr_release_t release,

		   dr_match_t match, void *match_data)

{

	void *res;



	res = devres_remove(dev, release, match, match_data);

	if (unlikely(!res))

		return -ENOENT;



	(*release)(dev, res);

	devres_free(res);

	return 0;

}

EXPORT_SYMBOL_GPL(devres_release);



static int remove_nodes(struct device *dev,

			struct list_head *first, struct list_head *end,

			struct list_head *todo)

include/linux/device.h

+2 −0
Original line number Diff line number Diff line
@@ -541,6 +541,8 @@ extern void *devres_remove(struct device *dev, dr_release_t release, 
			   dr_match_t match, void *match_data);

extern int devres_destroy(struct device *dev, dr_release_t release,

			  dr_match_t match, void *match_data);

extern int devres_release(struct device *dev, dr_release_t release,

			  dr_match_t match, void *match_data);



/* devres group */

extern void * __must_check devres_open_group(struct device *dev, void *id,