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

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Date:	Tue, 25 Mar 2014 11:48:59 -0700
From:	Sebastian Capella <sebastian.capella@...aro.org>
To:	Alexander Holler <holler@...oftware.de>
Cc:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	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

Hi Alexander,

Thanks for your comments.

I've posted a different solution for arm only here, that just causes a
while loop in machine_power_off in the event it's called but does not
halt.

https://lkml.org/lkml/2014/3/24/299

On 25 March 2014 11:38, Alexander Holler <holler@...oftware.de> wrote:
> Both states, power off and sys halt, do sound pretty final and I would
> assume something is broken, if power off is called before sys halt or vice
> versa. At least I would never expect that the reboot/poweroff/syshalt
> notifier may be called twice (and thats why the heartbeat-trigger may
> crash).
>
> But just in case, changing that behaviour in ledtrig-heartbeat.c would be
> pretty easy, just remove the heartbeat_reboot_notifier (which plays nice and
> deregisters the trigger on reboot) and use the panic_notifier (which doesn't
> unregister the trigger but just turns off the led) for reboot too. Another
> solution would be to unregister the reboot_notifier in the reboot_nofifier
> itself. I've just seen one watchdog driver (drivers/rtc/rtc-m41t80.c) which
> does that. But I still think such shouldn't be necessary (and I haven't had
> a look at other reboot_notifier users).

I hope this will all be handled by the loop in machine_power_off, so
maybe this will not be needed.

Thanks!

Sebastian
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