The patch titled
Subject: kernel/reboot.c: add devm_register_reboot_notifier()
has been added to the -mm tree. Its filename is
kernel-reboot-add-devm_register_reboot_notifier.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kernel-reboot-add-devm_register_reboot_notifier.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kernel-reboot-add-devm_register_reboot_notifier.patch
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------------------------------------------------------
From: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Subject: 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@xxxxxxxxx
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/reboot.h | 3 +++
kernel/reboot.c | 27 +++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
diff -puN include/linux/reboot.h~kernel-reboot-add-devm_register_reboot_notifier include/linux/reboot.h
--- a/include/linux/reboot.h~kernel-reboot-add-devm_register_reboot_notifier
+++ a/include/linux/reboot.h
@@ -38,6 +38,9 @@ extern int reboot_force;
extern int register_reboot_notifier(struct notifier_block *);
extern int unregister_reboot_notifier(struct notifier_block *);
+struct device;
+extern int devm_register_reboot_notifier(struct device *, struct notifier_block *);
+
extern int register_restart_handler(struct notifier_block *);
extern int unregister_restart_handler(struct notifier_block *);
extern void do_kernel_restart(char *cmd);
diff -puN kernel/reboot.c~kernel-reboot-add-devm_register_reboot_notifier kernel/reboot.c
--- a/kernel/reboot.c~kernel-reboot-add-devm_register_reboot_notifier
+++ a/kernel/reboot.c
@@ -104,6 +104,33 @@ int unregister_reboot_notifier(struct no
}
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.
_
Patches currently in -mm which might be from andrew.smirnov@xxxxxxxxx are
kernel-reboot-add-devm_register_reboot_notifier.patch
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