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kernel/reboot.c: add devm_register_reboot_notifier()

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Add devm_* wrapper around register_reboot_notifier to simplify device
specific reboot notifier registration/unregistration.

[akpm@linux-foundation.org: move `struct device' forward decl to top-of-file]
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Smirnov 2017-11-17 15:30:57 -08:00 • committed by Linus Torvalds
parent c512ac01d8
commit 2d8364bae4
2 changed files with 31 additions and 0 deletions
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27
kernel/reboot.c
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@ -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.