linux-kernel - Re: [RESEND PATCH 1/2] pinctrl: st: avoid multiple mutex lock

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Message-ID: <CACRpkdbOftsepHFBv32j-ty2+N3vDJPP27iMEWwZKO3ciRv0ug@mail.gmail.com>
Date:	Wed, 7 Jan 2015 10:44:11 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Patrice CHOTARD <patrice.chotard@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RESEND PATCH 1/2] pinctrl: st: avoid multiple mutex lock

On Mon, Jan 5, 2015 at 11:04 AM, Patrice CHOTARD <patrice.chotard@...com> wrote:

> From: Francesco VIRLINZI <francesco.virlinzi@...com>
>
> Using the sysfs inteface to inspect the pins configuration
> the system can walk around a path which acquires the same
> mutex twice.
>
> On STiH407 platform, for example :
> cat /sys/kernel/debug/pinctrl/920f080.pin-controller-front0/pinconf-pins
> hangs the kernel and never returns.
>
> With this patch the mutex is temporary freed.
>
> Signed-off-by: Francesco Virlinzi <francesco.virlinzi@...com>
> Signed-off-by: Patrice Chotard <patrice.chotard@...com>

Patch applied to fixes. Sorry for the delay.

Yours,
Linus Walleij
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