linux-kernel - Re: [PATCH] staging: iio: industrialio-core: Fix compiler warning

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Date:	Mon, 22 Aug 2011 12:37:49 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	"Maxin B. John" <maxin.john@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Manuel Stahl <manuel.stahl@....fraunhofer.de>,
	Bryan Freed <bfreed@...omium.org>, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: iio: industrialio-core: Fix compiler warning

On 08/22/11 11:08, Maxin B. John wrote:
> drivers/staging/iio/industrialio-core.c: In function
> 'iio_device_add_event_sysfs':
> drivers/staging/iio/industrialio-core.c:914: warning: 'mask' may be
> used uninitialized in this function
Thanks for the patch.  It's actually a driver bug if this occurs.
We could have had a WARN_ON to let userspace know about the bug and
indeed taken the error route you suggest but
the relevant code has actually undergone a rewrite anyway so the
bit you are fixing doesn't exist any more anyway.

See http://git.kernel.org/?p=linux/kernel/git/jic23/iio-blue.git;a=summary
For our current dev tree (eats babies and includes all sorts of stuff
that hasn't been reviewed yet - so beware).  

> Signed-off-by: Maxin B. John <maxin.john@...il.com>
> ---
> diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
> index 19819e7..83b5953 100644
> --- a/drivers/staging/iio/industrialio-core.c
> +++ b/drivers/staging/iio/industrialio-core.c
> @@ -911,7 +911,7 @@ static int iio_device_add_event_sysfs(struct iio_dev *dev_info,
>  				      struct iio_chan_spec const *chan)
>  {
>  
> -	int ret = 0, i, mask;
> +	int ret = 0, i, mask = 0;
>  	char *postfix;
>  	if (!chan->event_mask)
>  		return 0;
> @@ -944,6 +944,8 @@ static int iio_device_add_event_sysfs(struct iio_dev *dev_info,
>  			break;
>  		default:
>  			printk(KERN_INFO "currently unhandled type of event\n");
> +			ret = -EINVAL;
> +			goto error_ret;
>  		}
>  		ret = __iio_add_chan_devattr(postfix,
>  					     NULL,

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