linux-kernel - Re: [PATCH v2] drivers/tty: Folding Android's keyreset driver in sysRQ

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Message-ID: <20120830230129.GC21501@core.coreip.homeip.net>
Date:	Thu, 30 Aug 2012 16:01:29 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	mathieu.poirier@...aro.org
Cc:	linux-kernel@...r.kernel.org, rdunlap@...otime.net,
	arve@...roid.com, kernel-team@...roid.com, john.stultz@...aro.org
Subject: Re: [PATCH v2] drivers/tty: Folding Android's keyreset driver in
 sysRQ

Hi Matthieu,

On Thu, Aug 30, 2012 at 04:30:54PM -0600, mathieu.poirier@...aro.org wrote:
> From: "Mathieu J. Poirier" <mathieu.poirier@...aro.org>
> 
> This patch adds keyreset functionality to the sysrq driver. It
> allows certain button/key combinations to be used in order to
> trigger device resets.
> 
> The first time the key-combo is detected a work function that syncs
> the filesystems is scheduled and the kernel rebooted. If all the keys
> are released and then pressed again, it calls panic. Reboot on panic
> should be set for this to work.  A platform device that specify a
> reset key-combo should be added to the board file to trigger the
> feature.

Why do we need to involve a platform device and not use, for example, a module
parameter, that could be set up from userspace?

Also, why do we need reset_fn() and not simply invoke SysRq-B handler
that should call ctrl_alt_del() for us?

Thanks.

-- 
Dmitry
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