linux-kernel - Re: [PATCH] staging: comedi: drivers: usbduxsigma: Removed variables that is never used

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Date:	Thu, 29 Jan 2015 15:39:49 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bernd Porr <mail@...ndporr.me.uk>,
	Chase Southwood <chase.southwood@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: comedi: drivers: usbduxsigma: Removed variables
 that is never used

On 28/01/15 22:39, Rickard Strandqvist wrote:
> Variable ar assigned a value that is never used.
> I have also removed all the code that thereby serves no purpose.
>
> This was found using a static code analysis program called cppcheck
>
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>   drivers/staging/comedi/drivers/usbduxsigma.c |    3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c
> index dc19435..7b80887 100644
> --- a/drivers/staging/comedi/drivers/usbduxsigma.c
> +++ b/drivers/staging/comedi/drivers/usbduxsigma.c
> @@ -215,7 +215,6 @@ static void usbduxsigma_ai_handle_urb(struct comedi_device *dev,
>   	struct usbduxsigma_private *devpriv = dev->private;
>   	struct comedi_async *async = s->async;
>   	struct comedi_cmd *cmd = &async->cmd;
> -	unsigned int dio_state;
>   	uint32_t val;
>   	int ret;
>   	int i;
> @@ -225,7 +224,7 @@ static void usbduxsigma_ai_handle_urb(struct comedi_device *dev,
>   		devpriv->ai_counter = devpriv->ai_timer;
>
>   		/* get the state of the dio pins to allow external trigger */
> -		dio_state = be32_to_cpu(devpriv->in_buf[0]);
> +		be32_to_cpu(devpriv->in_buf[0]);

That line produces a compiler warning.  The line can be removed as the 
call to be32_to_cpu() has no side-effects.  The "/* get the state ..." 
comment line can also be removed as it is only associated with this line.

Perhaps Bernd intended to use dio_state for something here, but I'm not 
sure what.

>
>   		/* get the data from the USB bus and hand it over to comedi */
>   		for (i = 0; i < cmd->chanlist_len; i++) {
>


-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-
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