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notifier: Add blocking/atomic_notifier_chain_register_unique_prio()

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Add variant of blocking/atomic_notifier_chain_register() functions that
allow registration of a notifier only if it has unique priority, otherwise
-EBUSY error code is returned by the new functions.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dmitry Osipenko
2022-05-10 02:32:10 +03:00
committed by Rafael J. Wysocki
parent 13dfd97a34
commit c82f898d87
2 changed files with 74 additions and 19 deletions
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5
include/linux/notifier.h
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@@ -150,6 +150,11 @@ extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
struct notifier_block *nb);
extern int atomic_notifier_chain_register_unique_prio(
struct atomic_notifier_head *nh, struct notifier_block *nb);
extern int blocking_notifier_chain_register_unique_prio(
struct blocking_notifier_head *nh, struct notifier_block *nb);
extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
struct notifier_block *nb);
extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,