linux-kernel - Re: [PATCH 1/8] cciss: version number change

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Date:	Thu, 02 Nov 2006 16:05:14 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Mike Miller (OS Dev)" <mikem@...rdog.cca.cpqcorp.net>
Cc:	Jens Axboe <jens.axboe@...cle.com>, akpm@...l.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/8] cciss: version number change

On Thu, 2006-11-02 at 08:46 -0600, Mike Miller (OS Dev) wrote:
> On Thu, Nov 02, 2006 at 03:10:45PM +0100, Jens Axboe wrote:
> > On Wed, Nov 01 2006, Mike Miller (OS Dev) wrote:
> > > 
> > > PATCH 1/8
> > > 
> > > This patch changes the cciss version number to 3.6.14 to reflect the following
> > > functionality changes added by the rest of the set. They include:
> > 
> > Mike, only some of your patches appeared to go out, both in personal
> > mail and on the list.
> 
> I ran into some last minute issues so I stopped at 5. Still re-testing
> the others.
> This snippet seems to tbe the culprit.
> +               if (blk_queue_stopped(h->gendisk[curr_queue]->queue) ||
> +                   blk_queue_plugged(h->gendisk[curr_queue]->queue))
> +                       blk_start_queue(h->gendisk[curr_queue]->queue);
> 
> We're testing to see if the queue is stopped or plugged so we don't
> try to start am already running queue. Without the blk_queue_plugged
> test it hangs every time. We added blk_queue_plugged and the first tests
> seem to run ok. Then at the last minute something broke. Does this look
> ok to you?


it looks like a design mistake to me if a device driver needs to care
about a queue being plugged at all....


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