aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/base
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/devres.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 8731979d668a..724957a13d48 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -671,6 +671,80 @@ int devres_release_group(struct device *dev, void *id)
671EXPORT_SYMBOL_GPL(devres_release_group); 671EXPORT_SYMBOL_GPL(devres_release_group);
672 672
673/* 673/*
674 * Custom devres actions allow inserting a simple function call
675 * into the teadown sequence.
676 */
677
678struct action_devres {
679 void *data;
680 void (*action)(void *);
681};
682
683static int devm_action_match(struct device *dev, void *res, void *p)
684{
685 struct action_devres *devres = res;
686 struct action_devres *target = p;
687
688 return devres->action == target->action &&
689 devres->data == target->data;
690}
691
692static void devm_action_release(struct device *dev, void *res)
693{
694 struct action_devres *devres = res;
695
696 devres->action(devres->data);
697}
698
699/**
700 * devm_add_action() - add a custom action to list of managed resources
701 * @dev: Device that owns the action
702 * @action: Function that should be called
703 * @data: Pointer to data passed to @action implementation
704 *
705 * This adds a custom action to the list of managed resources so that
706 * it gets executed as part of standard resource unwinding.
707 */
708int devm_add_action(struct device *dev, void (*action)(void *), void *data)
709{
710 struct action_devres *devres;
711
712 devres = devres_alloc(devm_action_release,
713 sizeof(struct action_devres), GFP_KERNEL);
714 if (!devres)
715 return -ENOMEM;
716
717 devres->data = data;
718 devres->action = action;
719
720 devres_add(dev, devres);
721 return 0;
722}
723EXPORT_SYMBOL_GPL(devm_add_action);
724
725/**
726 * devm_remove_action() - removes previously added custom action
727 * @dev: Device that owns the action
728 * @action: Function implementing the action
729 * @data: Pointer to data passed to @action implementation
730 *
731 * Removes instance of @action previously added by devm_add_action().
732 * Both action and data should match one of the existing entries.
733 */
734void devm_remove_action(struct device *dev, void (*action)(void *), void *data)
735{
736 struct action_devres devres = {
737 .data = data,
738 .action = action,
739 };
740
741 WARN_ON(devres_destroy(dev, devm_action_release, devm_action_match,
742 &devres));
743
744}
745EXPORT_SYMBOL_GPL(devm_remove_action);
746
747/*
674 * Managed kzalloc/kfree 748 * Managed kzalloc/kfree
675 */ 749 */
676static void devm_kzalloc_release(struct device *dev, void *res) 750static void devm_kzalloc_release(struct device *dev, void *res)