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Subject[PATCH 4/6] ARM: Register with kernel restart handler
Date
From: Guenter Roeck <linux@roeck-us.net>

By making use of the kernel restart handler, board specific restart
handlers can be prioritized amongst available mechanisms for a particular
board or system.

Select the default priority of 128 to indicate that the restart callback
in the machine description is the default restart mechanism.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
arch/arm/kernel/setup.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index f4e54503afa9..cc4f9564f4e3 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1058,6 +1058,20 @@ void __init hyp_mode_check(void)
#endif
}

+static void (*__arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
+
+static int arm_restart(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ __arm_pm_restart(action, data);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block arm_restart_nb = {
+ .notifier_call = arm_restart,
+ .priority = 128,
+};
+
void __init setup_arch(char **cmdline_p)
{
const struct machine_desc *mdesc;
@@ -1107,8 +1121,10 @@ void __init setup_arch(char **cmdline_p)
paging_init(mdesc);
request_standard_resources(mdesc);

- if (mdesc->restart)
- arm_pm_restart = mdesc->restart;
+ if (mdesc->restart) {
+ __arm_pm_restart = mdesc->restart;
+ register_restart_handler(&arm_restart_nb);
+ }

unflatten_device_tree();

--
2.11.0
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