diff options
| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2017-05-09 09:47:52 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-05-09 13:09:15 +1000 |
| commit | ab67b2aad92b8644b43a069a0d7563fe3209a4d1 (patch) | |
| tree | 13e143fd53385dea1087ef4084a4ea3332b907ed /kernel | |
| parent | 70f8fa5a0c5d346bcda03fa8db1acda66a45f5f6 (diff) | |
kernel/reboot.c: add devm_register_reboot_notifier()
Add devm_* wrapper around register_reboot_notifier to simplify device
specific reboot notifier registration/unregistration.
Link: http://lkml.kernel.org/r/20170320171753.1705-1-andrew.smirnov@gmail.com
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/reboot.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/reboot.c b/kernel/reboot.c index bd30a973fe94..e4ced883d8de 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -104,6 +104,33 @@ int unregister_reboot_notifier(struct notifier_block *nb) } EXPORT_SYMBOL(unregister_reboot_notifier); +static void devm_unregister_reboot_notifier(struct device *dev, void *res) +{ + WARN_ON(unregister_reboot_notifier(*(struct notifier_block **)res)); +} + +int devm_register_reboot_notifier(struct device *dev, struct notifier_block *nb) +{ + struct notifier_block **rcnb; + int ret; + + rcnb = devres_alloc(devm_unregister_reboot_notifier, + sizeof(*rcnb), GFP_KERNEL); + if (!rcnb) + return -ENOMEM; + + ret = register_reboot_notifier(nb); + if (!ret) { + *rcnb = nb; + devres_add(dev, rcnb); + } else { + devres_free(rcnb); + } + + return ret; +} +EXPORT_SYMBOL(devm_register_reboot_notifier); + /* * Notifier list for kernel code which wants to be called * to restart the system. |