linux-kernel - Re: [PATCH 1/2] drivers: create a pin control subsystem v7

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Date:	Wed, 28 Sep 2011 11:18:59 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stijn Devriendt <highguy@...il.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Stephen Warren <swarren@...dia.com>,
	Barry Song <21cnbao@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Joe Perches <joe@...ches.com>,
	Russell King <linux@....linux.org.uk>,
	Linaro Dev <linaro-dev@...ts.linaro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	David Brown <davidb@...eaurora.org>
Subject: Re: [PATCH 1/2] drivers: create a pin control subsystem v7

On Tue, Sep 27, 2011 at 11:30 AM, Stijn Devriendt <highguy@...il.com> wrote:
>> +       spin_unlock(&desc->lock);
>
> Now this is racing with...
> (...)
> ... this:
>
>> +       spin_lock(&desc->lock);
>> +       desc->mux_requested = true;
>> +       strncpy(desc->mux_function, function, sizeof(desc->mux_function));
>> +       spin_unlock(&desc->lock);

Good catch!

I've fixed it by setting ->mux_requested immediatelty and then
later release it (inside a lock) if something fails.

Yours,
Linus Walleij
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