linux-kernel - Re: [PATCH 6/7] iio: light: tsl2583: add locking to sysfs *

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Message-ID: <20161019113345.GJ4469@mwanda>
Date:   Wed, 19 Oct 2016 14:33:46 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Brian Masney <masneyb@...tation.org>
Cc:     jic23@...nel.org, devel@...verdev.osuosl.org, lars@...afoo.de,
        linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, pmeerw@...erw.net, knaack.h@....de
Subject: Re: [PATCH 6/7] iio: light: tsl2583: add locking to sysfs *_store()
 functions

On Wed, Oct 19, 2016 at 06:32:09AM -0400, Brian Masney wrote:
> @@ -778,6 +796,8 @@ static ssize_t illuminance0_lux_table_store(struct device *dev,
>  		goto luxable_store_done;
>  	}
>  
> +	mutex_lock(&chip->als_mutex);
> +
>  	if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
>  		ret = taos_chip_off(indio_dev);
>  		if (ret < 0)
> @@ -794,6 +814,8 @@ static ssize_t illuminance0_lux_table_store(struct device *dev,
>  
>  	ret = len;
>  
> +	mutex_unlock(&chip->als_mutex);
> +
>  luxable_store_done:
>  	return ret;
>  }


HAHAHHA HAHAHAH HAH AHHA HAHHAH AH HAHAHHAHAH AHHAHHAHAHHA HAHA HAHAHAH.

*wipes tear from eye*.  *continues laughing*.

HAHAHAHAHHAHAHA HAHA HAHAHAHA HAHAHA HAHAHAH AHAHAHAHA AHHAHAH.

This patch introduces a return with lock held bug.  All those do nothing
gotos, and we still missed when we actually had to do a "goto unlock".
If every function is special and complicated that reall means that no
functions are special.

Don't do do-nothing gotos.

regards,
dan carpenter