Messages in this thread Patch in this message | | | From | Jenny TC <> | Subject | [PATCH] kernel_notifier: register conditional raw notifier | Date | Wed, 8 Aug 2012 16:27:08 +0530 |
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Introduce a new API raw_notifier_chain_cond_register to add a notifier to a raw notifier chain, only if notifier not already present in the chain.
Signed-off-by: Jenny TC <jenny.tc@intel.com> --- kernel/notifier.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/kernel/notifier.c b/kernel/notifier.c index 2d5cc4c..267e26f 100644 --- a/kernel/notifier.c +++ b/kernel/notifier.c @@ -349,6 +349,24 @@ int raw_notifier_chain_register(struct raw_notifier_head *nh, EXPORT_SYMBOL_GPL(raw_notifier_chain_register); /** + * raw_notifier_chain_cond_register - Cond add notifier to a raw notifier chain + * @nh: Pointer to head of the raw notifier chain + * @n: New entry in notifier chain + * + * Adds a notifier to a raw notifier chain, only if not already + * present in the chain. + * All locking must be provided by the caller. + * + * Currently always returns zero. + */ +int raw_notifier_chain_cond_register(struct raw_notifier_head *nh, + struct notifier_block *n) +{ + return notifier_chain_cond_register(&nh->head, n); +} +EXPORT_SYMBOL_GPL(raw_notifier_chain_cond_register); + +/** * raw_notifier_chain_unregister - Remove notifier from a raw notifier chain * @nh: Pointer to head of the raw notifier chain * @n: Entry to remove from notifier chain -- 1.7.9.5
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