linux-kernel - Re: leds/leds-pca9532.c: sleeping function called in .brightness

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Date:	Wed, 03 Dec 2008 10:03:27 +0000
From:	Richard Purdie <rpurdie@...ys.net>
To:	Guennadi Liakhovetski <lg@...x.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: leds/leds-pca9532.c: sleeping function called in
	.brightness_set()

On Mon, 2008-11-24 at 10:51 +0100, Guennadi Liakhovetski wrote:
> this seems to explicitly violate the API as documented in 
> include/linux/leds.h:
> 
> 	/* Set LED brightness level */
> 	/* Must not sleep, use a workqueue if needed */
> 	void		(*brightness_set)(struct led_classdev *led_cdev,
> 					  enum led_brightness brightness);
> 
> and also contradicts some other drivers, e.g., pca955x, which do use a 
> workqueue as suggested: leds-pca9532.c::pca9532_set_brightness uses a 
> mutex for locking and calls i2c_smbus functions directly. Needs to be 
> fixed (if it hasn't been fixed yet), probably, also vor 2.6.27-stable.

There is a patch queued to fix this now. I'll submit some fixes to
2.6.28-rcX shortly and then we can consider it for -stable.

Cheers,

Richard

-- 
Richard Purdie
Intel Open Source Technology Centre

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