linux-kernel - Re: [PATCH] block: fix blk_queue_end

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Date:	Wed, 21 Dec 2011 09:37:17 -0800
From:	"Williams, Dan J" <dan.j.williams@...el.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Tao Ma <tm@....ma>, Meelis Roos <mroos@...ux.ee>, axboe@...nel.dk,
	Tao Ma <boyu.mt@...bao.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, Ed Nadolski <edmund.nadolski@...el.com>
Subject: Re: [PATCH] block: fix blk_queue_end_tag()

On Wed, Dec 21, 2011 at 5:20 AM, Matthew Wilcox <matthew@....cx> wrote:
> On Tue, Dec 20, 2011 at 11:30:14PM -0800, Williams, Dan J wrote:
>> @@ -284,16 +284,7 @@ void blk_queue_end_tag(struct request_queue *q,
>> struct request *rq)
>>         struct blk_queue_tag *bqt = q->queue_tags;
>>         int tag = rq->tag;
>>
>> -       BUG_ON(tag == -1);
>> -
>> -       if (unlikely(tag >= bqt->max_depth)) {
>> -               /*
>> -                * This can happen after tag depth has been reduced.
>> -                * But tag shouldn't be larger than real_max_depth.
>> -                */
>> -               WARN_ON(tag >= bqt->real_max_depth);
>> -               return;
>> -       }
>> +       BUG_ON(tag == -1 || tag > bqt->real_max_depth);
>
> or ...
>
> -       int tag = rq->tag;
> +       unsigned tag = rq->tag;
> +       BUG_ON(tag >= bqt->real_max_depth);
>
> since tags in the range INT_MIN to -2 are also a bug, right?

Yes, even better... patch coming up.
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