linux-kernel - Re: [patch] [media] em28xx-i2c: rt_mutex

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Date:	Sat, 7 May 2016 10:01:56 -0300
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] [media] em28xx-i2c: rt_mutex_trylock() returns zero on
 failure

Em Fri, 11 Mar 2016 11:13:01 +0300
Dan Carpenter <dan.carpenter@...cle.com> escreveu:

> The code is checking for negative returns but it should be checking for
> zero.
> 
> Fixes: aab3125c43d8 ('[media] em28xx: add support for registering multiple i2c buses')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> Is -EBUSY correct?  -EAGAIN?

I guess -EAGAIN would be better.

Regards,
Mauro

> 
> diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
> index a19b5c8..f80dd3a 100644
> --- a/drivers/media/usb/em28xx/em28xx-i2c.c
> +++ b/drivers/media/usb/em28xx/em28xx-i2c.c
> @@ -507,9 +507,8 @@ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
>  	if (dev->disconnected)
>  		return -ENODEV;
>  
> -	rc = rt_mutex_trylock(&dev->i2c_bus_lock);
> -	if (rc < 0)
> -		return rc;
> +	if (!rt_mutex_trylock(&dev->i2c_bus_lock))
> +		return -EBUSY;
>  
>  	/* Switch I2C bus if needed */
>  	if (bus != dev->cur_i2c_bus &&
> --
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-- 
Thanks,
Mauro