linux-kernel - Re: [PATCH v2 3/5] arm: Support reboot through watchdog subsystem

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Date:	Wed, 14 May 2014 18:37:52 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-watchdog@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
CC:	Wim Van Sebroeck <wim@...ana.be>,
	Catalin Marinas <catalin.marinas@....com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <linux@....linux.org.uk>,
	Jonas Jensen <jonas.jensen@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] arm: Support reboot through watchdog subsystem

On 05/09/2014 05:31 PM, Guenter Roeck wrote:
> The watchdog subsystem provides an API to perform a system reboot.
> Use it.
>
> With this change, the arm_pm_restart callback is now optional,
> so check if it is set before calling it.
>
> Tested-by: Jonas Jensen <jonas.jensen@...il.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Any comments / ack from the arm maintainers ?

Thanks,
Guenter

> ---
> v2: No change
>
>   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..c3b7b5e 100644
> --- a/arch/arm/kernel/process.c
> +++ b/arch/arm/kernel/process.c
> @@ -32,6 +32,7 @@
>   #include <linux/hw_breakpoint.h>
>   #include <linux/leds.h>
>   #include <linux/reboot.h>
> +#include <linux/watchdog.h>
>
>   #include <asm/cacheflush.h>
>   #include <asm/idmap.h>
> @@ -230,7 +231,10 @@ void machine_restart(char *cmd)
>   	local_irq_disable();
>   	smp_send_stop();
>
> -	arm_pm_restart(reboot_mode, cmd);
> +	if (arm_pm_restart)
> +		arm_pm_restart(reboot_mode, cmd);
> +
> +	watchdog_do_reboot(reboot_mode, cmd);
>
>   	/* Give a grace period for failure to restart of 1s */
>   	mdelay(1000);
>

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