linux-kernel - Re: [PATCH] staging: comedi: drivers: addi-data: hwdrv_apci3501: Removed variables that is never used

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Message-ID: <54CA4E69.7070506@mev.co.uk>
Date:	Thu, 29 Jan 2015 15:14:49 +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>,
	Chase Southwood <chase.southwood@...il.com>,
	Marcin Kostrzewa <marckostrzewa@...il.com>,
	Fred Akers <knivey@...ops.net>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: comedi: drivers: addi-data: hwdrv_apci3501:
 Removed variables that is never used

On 28/01/15 21:51, 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/addi-data/hwdrv_apci3501.c |    3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3501.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3501.c
> index 339519a..24126e3 100644
> --- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3501.c
> +++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3501.c
> @@ -93,7 +93,6 @@ static int apci3501_write_insn_timer(struct comedi_device *dev,
>   {
>   	struct apci3501_private *devpriv = dev->private;
>   	unsigned int ul_Command1 = 0;
> -	int i_Temp;
>
>   	if (devpriv->b_TimerSelectMode == ADDIDATA_WATCHDOG) {
>
> @@ -135,7 +134,7 @@ static int apci3501_write_insn_timer(struct comedi_device *dev,
>   		}
>   	}
>
> -	i_Temp = inl(dev->iobase + APCI3501_TIMER_STATUS_REG) & 0x1;
> +	inl(dev->iobase + APCI3501_TIMER_STATUS_REG) & 0x1;

The ' & 0x1' part produces compiler warnings and should be removed.

I don't know if the inl() call has any side-effects or not, but since 
it's part of the watchdog functionality of this board, it's safest to 
leave it in.

>   	return insn->n;
>   }
>
>

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