linux-kernel - Re: [Suggestion] drivers/block/aoe: using uninitialized variable.

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Date:	Wed, 27 Mar 2013 14:04:58 +0000
From:	Ed Cashin <ecashin@...aid.com>
To:	Chen Gang <gang.chen@...anux.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [Suggestion] drivers/block/aoe: using uninitialized variable.

Thanks.  Jens Axboe said about it to Dan Carpenter that ...

> It was fixed up yesterday, it was a merge error in the for-next branch.

On Mar 27, 2013, at 3:14 AM, Chen Gang wrote:

> Hello Ed L. Cashin
> 
>  when compiling with EXTRA_CFLAGS=-W
> 
>  get the warning:
>    drivers/block/aoe/aoecmd.c:931:20: warning: ‘bv’ is used uninitialized in this function [-Wuninitialized]
> 
>  bv is really not initialized.
>    (and it seems only set "buf->bv_resid = 0" is not enough).
> 
>  thanks.
> 
> gchen.
> 
> 919 static void
> 920 bufinit(struct buf *buf, struct request *rq, struct bio *bio)
> 921 {
> 922         struct bio_vec *bv;
> 923 
> 924         memset(buf, 0, sizeof(*buf));
> 925         buf->rq = rq;
> 926         buf->bio = bio;
> 927         buf->resid = bio->bi_size;
> 928         buf->sector = bio->bi_sector;
> 929         bio_pageinc(bio);
> 930         buf->bv = bio_iovec(bio);
> 931         buf->bv_resid = bv->bv_len;
> 932         WARN_ON(buf->bv_resid == 0);
> 933 }
> 
> 

-- 
  Ed Cashin
  ecashin@...aid.com


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