linux-kernel - Re: [PATCH] scsi: remove superfluous NULL pointer check from scsi_kill

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Date:	Sat, 25 Jul 2009 08:42:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	James.Bottomley@...senpartnership.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Dan Carpenter <error27@...il.com>, corbet@....net,
	eteo@...hat.com
Subject: Re: [PATCH] scsi: remove superfluous NULL pointer check from
 scsi_kill_request()

On Sun, 2009-07-26 at 16:29 +0200, Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Subject: [PATCH] scsi: remove superfluous NULL pointer check from scsi_kill_request()
> 
> >From Dan's list:
> 
> drivers/scsi/scsi_lib.c +1365 scsi_kill_request(9) warning: variable derefenced in initializer 'cmd'
> drivers/scsi/scsi_lib.c +1365 scsi_kill_request(9) warning: variable derefenced before check 'cmd'
> 
> We dereference cmd (and possible OOPS if cmd == NULL) before starting
> the request so just remove the superfluous debugging code altogether.
> 
> Reported-by: Dan Carpenter <error27@...il.com>
> Cc: corbet@....net
> Cc: eteo@...hat.com
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> ---
>  drivers/scsi/scsi_lib.c |    6 ------
>  1 file changed, 6 deletions(-)
> 
> Index: b/drivers/scsi/scsi_lib.c
> ===================================================================
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1365,12 +1365,6 @@ static void scsi_kill_request(struct req
>  
>  	blk_start_request(req);
>  
> -	if (unlikely(cmd == NULL)) {
> -		printk(KERN_CRIT "impossible request in %s.\n",
> -				 __func__);
> -		BUG();
> -	}
> -
>  	scsi_init_cmd_errh(cmd);
>  	cmd->result = DID_NO_CONNECT << 16;
>  	atomic_inc(&cmd->device->iorequest_cnt);
> --
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