linux-kernel - Re: [PATCH] gpio: remove spurious gpio

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Message-ID: <20100723045807.GA14875@pengutronix.de>
Date:	Fri, 23 Jul 2010 06:58:07 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Gregory Bean <gbean@...eaurora.org>
Cc:	akpm@...ux-foundation.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jani Nikula <ext-jani.1.nikula@...ia.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH] gpio: remove spurious gpio_unexport debug error.

Hello,

On Thu, Jul 22, 2010 at 02:05:58PM -0700, Gregory Bean wrote:
> Make gpio_unexport generate success instead of an -EINVAL
> if asked to unexport a line which is not exported, because
> the only result of that condition is a pr_debug
> which complains of what is really a harmless no-op:
> when an unexported gpio is unexported again, nothing happens.
> That's not a failure, just a trivial border case.
> Since gpio_free calls gpio_unexport unconditionally
> and exported gpio lines are uncommon, most calls to
> gpio_free with debug flags enabled generate -EINVAL
> warnings in the log, causing unnecessary stress.
I noticed that a few days ago, too.  Just didn't come around to fix it
myself.
 
> Signed-off-by: Gregory Bean <gbean@...eaurora.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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