linux-kernel - Re: [PATCH 1/6] Core driver for WM97xx touchscreens

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Message-ID: <20080207170112.ZZRA012@mailhub.coreip.homeip.net>
Date:	Thu, 7 Feb 2008 17:07:23 -0500
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	Dmitry Baryshkov <dbaryshkov@...il.com>,
	Liam Girdwood <liam.girdwood@...fsonmicro.com>,
	Graeme Gregory <gg@...nsource.wolfsonmicro.com>,
	Mike Arthur <mike.arthur@...fsonmicro.com>,
	Stanley Cai <stanley.cai@...el.com>,
	Rodolfo Giometti <giometti@...eenne.com>,
	Russell King <rmk@....linux.org.uk>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Ian Molton <spyro@....com>,
	Vincent Sanders <vince@...likki.org>,
	Andrew Zabolotny <zap@...elink.ru>
Subject: Re: [PATCH 1/6] Core driver for WM97xx touchscreens

Hi Mark,

On Sat, Jan 26, 2008 at 05:28:31PM +0000, Mark Brown wrote:
> +
> +	/* register our battery device */
> +	wm->battery_dev = platform_device_alloc("wm97xx-battery", 0);
> +	if (!wm->battery_dev)
> +		goto batt_err;
...
> + batt_err:
> +	input_unregister_device(wm->input_dev);
> +	kfree(wm);
> +	return ret;
> +}

The probe error handling is not quite correct. When we reach the fragment
above ret variable is 0 so if platfrom_device_alloc() fails we will return
0 and the device will be considered bound but in half-dead state. Please
make sure that proper error is returned in all cases. Also please do not
mix out of line and in-line error unwinding (input_free_device() should
be called in the error path and if you are concerned about double-free
after input_unregister_device() just set wm->input_dev to NULL there).

Thanks.

-- 
Dmitry
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