linux-kernel - Re: [patch 29/30] hwmon: s3c-hwmon: Use a real mutex

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Message-ID: <20100908153932.417111d0@hyperion.delvare>
Date:	Wed, 8 Sep 2010 15:39:32 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ben Dooks <ben-linux@...ff.org>, lm-sensors@...sensors.org
Subject: Re: [patch 29/30] hwmon: s3c-hwmon: Use a real mutex

On Tue, 07 Sep 2010 14:33:57 -0000, Thomas Gleixner wrote:
> The semaphore which protects the ADC is semantically a mutex. Use a
> real mutex.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Jean Delvare <khali@...ux-fr.org>
> Cc: Ben Dooks <ben-linux@...ff.org>
> Cc: lm-sensors@...sensors.org
> ---
>  drivers/hwmon/s3c-hwmon.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> Index: linux-2.6/drivers/hwmon/s3c-hwmon.c
> ===================================================================
> --- linux-2.6.orig/drivers/hwmon/s3c-hwmon.c
> +++ linux-2.6/drivers/hwmon/s3c-hwmon.c
> @@ -51,7 +51,7 @@ struct s3c_hwmon_attr {
>   * @attr: The holders for the channel attributes.
>  */
>  struct s3c_hwmon {
> -	struct semaphore	lock;
> +	struct mutex		lock;
>  	struct s3c_adc_client	*client;
>  	struct device		*hwmon_dev;
>  
> @@ -73,14 +73,14 @@ static int s3c_hwmon_read_ch(struct devi
>  {
>  	int ret;
>  
> -	ret = down_interruptible(&hwmon->lock);
> +	ret = mutex_lock_interruptible(&hwmon->lock);
>  	if (ret < 0)
>  		return ret;
>  
>  	dev_dbg(dev, "reading channel %d\n", channel);
>  
>  	ret = s3c_adc_read(hwmon->client, channel);
> -	up(&hwmon->lock);
> +	mutex_unlock(&hwmon->lock);
>  
>  	return ret;
>  }
> @@ -296,7 +296,7 @@ static int __devinit s3c_hwmon_probe(str
>  
>  	platform_set_drvdata(dev, hwmon);
>  
> -	init_MUTEX(&hwmon->lock);
> +	mutex_init(&hwmon->lock);
>  
>  	/* Register with the core ADC driver. */
>  
> 
> 

Applied, thanks.

-- 
Jean Delvare
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