linux-kernel - Re: [PATCH 3/3] staging: comedi: dt3000: remove unneeded variable

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Date:	Sun, 17 Aug 2014 11:20:18 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Chase Southwood <chase.southwood@...il.com>,
	<gregkh@...uxfoundation.org>
CC:	<hsweeten@...ionengravers.com>, <devel@...verdev.osuosl.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] staging: comedi: dt3000: remove unneeded variable

On 17/08/14 05:26, Chase Southwood wrote:
> Coccinelle (using scripts/coccinelle/tests/doublebitand.cocci) found this
> assignment because 0 is or'd twice.  Upon inspection, I found that the
> variable "mode" is only assigned once and used once, and thus can be
> cleanly removed.  This patch plugs its value straight into writew() and
> then removes the variable.
>
> Signed-off-by: Chase Southwood <chase.southwood@...il.com>
> Cc: Ian Abbott <abbotti@....co.uk>
> Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
> ---
> It occurred to me while doing this that zero might be or'd twice to
> indicate "no information" in order to maintain some three-part structure
> used elsewhere.  If this is the case, I think that the variable could
> still be removed and the "| 0 | 0" could be added to the writew().
>
>   drivers/staging/comedi/drivers/dt3000.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)

This shouldn't be in the same series as the other two patches, but never 
mind.

Reviewed-by: Ian Abbott <abbotti@....co.uk>

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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