[PATCH v2 3/7] arm: Support restart through restart notifier call chain

Guenter Roeck linux at roeck-us.net
Sun Jul 6 16:38:16 PDT 2014

The kernel core now supports a notifier call chain for system
restart functions.

With this change, the arm_pm_restart callback is now optional,
so check if it is set before calling it. Only call the notifier
functions if arm_pm_restart is not set.

Signed-off-by: Guenter Roeck <linux at roeck-us.net>
v2: Only call notifier call chain if arm_pm_restart is not set
    Do not include linux/watchdog.h

 arch/arm/kernel/process.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 81ef686..5108e45 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -230,7 +230,11 @@ void machine_restart(char *cmd)
-	arm_pm_restart(reboot_mode, cmd);
+	if (arm_pm_restart)
+		arm_pm_restart(reboot_mode, cmd);
+	else
+		blocking_notifier_call_chain(&restart_notifier_list,
+					     reboot_mode, cmd);
 	/* Give a grace period for failure to restart of 1s */

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