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Date: Wed, 29 Mar 2017 16:17:38 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Andrey Smirnov <andrew.smirnov@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH] kernel/reboot: add devm_register_reboot_notifier On Mon, 20 Mar 2017 10:17:53 -0700 Andrey Smirnov <andrew.smirnov@...il.com> wrote: > Add devm_* wrapper around register_reboot_notifier to simplify device > specific reboot notifier registration/unregistration. > > --- 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); Seems reasonable. Can we please have some patches which actually use this?
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