linux-kernel - Re: [PATCH] block: fix returnvar.cocci warnings

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Date:	Wed, 27 May 2015 19:38:11 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Rik van Riel <riel@...hat.com>,
	Julia Lawall <julia.lawall@...6.fr>,
	Christoph Hellwig <hch@....de>
CC:	Jeff Moyer <jmoyer@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: fix returnvar.cocci warnings

On 05/27/2015 07:36 PM, Rik van Riel wrote:
> On 05/26/2015 03:59 PM, Julia Lawall wrote:
>> Remove unneeded variable used to store return value.
>>
>> Generated by: scripts/coccinelle/misc/returnvar.cocci
>>
>> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
>> Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
>> ---
>>
>> One could check whether the ret variable was intended to be used for
>> anything.
>
> Which tree is this against?
>
> Linus's latest tree still has this in _submit_bh
> (unless git didn't pull the latest updates right):
>
>          if (buffer_meta(bh))
>                  rw |= REQ_META;
>          if (buffer_prio(bh))
>                  rw |= REQ_PRIO;
>
>          bio_get(bio);
>          submit_bio(rw, bio);
>
>          if (bio_flagged(bio, BIO_EOPNOTSUPP))
>                  ret = -EOPNOTSUPP;
>
>          bio_put(bio);
>          return ret;

for-4.2/core has dropped the EOPNOTSUPP parts, that's where Julia found 
the issue of the now unused 'ret'.

-- 
Jens Axboe

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