From: Jens Axboe <axboe@suse.de>
To: Lou Langholtz <ldl@aros.net>
Cc: Paul Clements <Paul.Clements@SteelEye.com>,
Andrew Morton <akpm@osdl.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.6.0 NBD driver: remove send/recieve race for request
Date: Fri, 8 Aug 2003 08:59:08 +0200 [thread overview]
Message-ID: <20030808065908.GB18823@suse.de> (raw)
In-Reply-To: <3F334396.7030008@aros.net>
On Fri, Aug 08 2003, Lou Langholtz wrote:
> >@@ -499,12 +508,14 @@ static void do_nbd_request(request_queue
> > lo->disk->disk_name);
> > spin_lock(&lo->queue_lock);
> > list_del_init(&req->queuelist);
> >+ req->ref_count--;
> > spin_unlock(&lo->queue_lock);
> > nbd_end_request(req);
> > spin_lock_irq(q->queue_lock);
> > continue;
> > }
> >
> >+ req->ref_count--;
> > spin_lock_irq(q->queue_lock);
> >
> Since ref_count isn't atomic, shouldn't ref_count only be changed while
> the queue_lock is held???
Indeed, needs to be done after regrabbing the lock.
--
Jens Axboe
next prev parent reply other threads:[~2003-08-08 6:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-05 16:51 [PATCH] 2.6.0 NBD driver: remove send/recieve race for request Lou Langholtz
2003-08-05 19:37 ` Paul Clements
2003-08-05 22:48 ` Lou Langholtz
2003-08-06 0:51 ` Paul Clements
2003-08-06 7:34 ` Lou Langholtz
2003-08-08 5:02 ` Paul Clements
2003-08-08 5:27 ` Andrew Morton
2003-08-08 17:05 ` Paul Clements
2003-08-08 6:30 ` Lou Langholtz
2003-08-08 6:43 ` Andrew Morton
2003-08-08 6:59 ` Jens Axboe [this message]
2003-08-08 15:00 ` Paul Clements
2003-08-25 9:58 ` Jens Axboe
2003-08-08 16:47 ` Paul Clements
2003-08-08 20:07 ` [PATCH 2.6.0-test2-mm] nbd: fix send/receive/shutdown/disconnect races Paul Clements
2003-08-09 22:10 ` [PATCH 2.4.22-pre] nbd: fix race conditions Paul Clements
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