Messages in this thread Patch in this message | | | From | Jenny TC <> | Subject | [PATCH v2] kernel_notifier: register conditional raw notifier | Date | Wed, 8 Aug 2012 20:56:23 +0530 |
| |
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> --- v1 * Added API definition v2 * Added API decalarion include/linux/notifier.h | 2 ++ kernel/notifier.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+)
diff --git a/include/linux/notifier.h b/include/linux/notifier.h index d65746e..67895f0 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h @@ -124,6 +124,8 @@ extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh, extern int blocking_notifier_chain_cond_register( struct blocking_notifier_head *nh, struct notifier_block *nb); +extern int raw_notifier_chain_cond_register(struct raw_notifier_head *nh, + struct notifier_block *nb); extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh, struct notifier_block *nb); 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
| |