linux-kernel - Re: [PATCH v7 2/2] ARM hibernation / suspend-to-disk

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Message-ID: <CADHgK6vkwjXyJxRcOXjJpJJaR0-YR869NpPZ+CBBS8kEdE0qCQ@mail.gmail.com>
Date:	Wed, 19 Mar 2014 14:06:54 -0700
From:	Sebastian Capella <sebastian.capella@...aro.org>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Len Brown <len.brown@...el.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Russell King <linux@....linux.org.uk>,
	Jonathan Austin <jonathan.austin@....com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Victor Kamensky <victor.kamensky@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Sricharan R <r.sricharan@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Russ Dill <Russ.Dill@...com>, Nicolas Pitre <nico@...aro.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Jiang Liu <liuj97@...il.com>
Subject: Re: [PATCH v7 2/2] ARM hibernation / suspend-to-disk

On 19 March 2014 13:47, Sebastian Capella <sebastian.capella@...aro.org> wrote:
> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
> index a5f702a..d96b910 100644
> --- a/kernel/power/hibernate.c
> +++ b/kernel/power/hibernate.c
> @@ -594,7 +594,8 @@ static void power_down(void)
>         case HIBERNATION_PLATFORM:
>                 hibernation_platform_enter();
>         case HIBERNATION_SHUTDOWN:
> -               kernel_power_off();
> +               if (pm_power_off)
> +                       kernel_power_off();
>                 break;
>  #ifdef CONFIG_SUSPEND
>         case HIBERNATION_SUSPEND:
>
>
> This follows the behavior in the reboot syscall which does it this way
> also.  I'm testing this now, and it seems work fine.  If this looks
> good, I can add it as an additional patch.

BTW, one thing I would point out is that kernel_power_off and
kernel_halt call the same notifier but with different parameters
(SYS_POWER_OFF and SYS_HALT).

If pm_power_down is null, I dont see why we'd want to notify
SYS_POWER_OFF before SYS_HALT.  With the previous change I'm assuming
there's no benefit, so please chime in if you know a reason.

Thanks,

Sebastian
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