linux-kernel - Re: [PATCH 1/4] pinctrl: dove: Prevent NULL dereference if of_match

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Message-ID: <20121115083511.08f5a16f@skate>
Date:	Thu, 15 Nov 2012 08:35:11 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Axel Lin <axel.lin@...ics.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/4] pinctrl: dove: Prevent NULL dereference if
 of_match_device returns NULL

Dear Axel Lin,

On Thu, 15 Nov 2012 12:51:36 +0800, Axel Lin wrote:
> of_match_device() may return NULL.
> 
> Signed-off-by: Axel Lin <axel.lin@...ics.com>

Could you detail under what conditions of_match_device() may return
NULL in the specific case of this driver? This of_match_device() call
is using the same dove_pinctrl_of_match array that is used to ->probe()
this driver. So I don't see how you can get into ->probe() without
having a matching entry.

Am I missing something?

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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