From: Ross Biro <rossb@google.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: alan@redhat.com, Stephan von Krawczynski <skraw@ithnet.com>,
linux-kernel@vger.kernel.org
Subject: Re: 2.4.21-pre4: PDC ide driver problems with shared interrupts
Date: Wed, 05 Feb 2003 08:56:35 -0800 [thread overview]
Message-ID: <3E414243.4090303@google.com> (raw)
In-Reply-To: 1044443761.685.44.camel@zion.wanadoo.fr
Benjamin Herrenschmidt wrote:
>>Okay, I had to watch for it a bit longer and it turns out that the kernel PDC driver has a problem in this shared interrupt setup. When loads get high it seems to run into some timing problem which causes things like:
>>
>>Feb 4 01:02:22 admin kernel: hde: dma_intr: status=0xd0 { Busy }
>>
>>
>>
Since the busy bit is set, we know the drive must have received a
command. Since dma_intr thought the drive was not busy, an interrupt
must have snuck through between the command being issued and the dma
being started. I think in my original patch, I had the dma start
outside of the spinlock, that is a bug. The command to the controller
to start the dma must be inside of the spinlock.
I have not looked at 2.4.21-pre4 at all, so I could be entirely off base
here.
Ross
next prev parent reply other threads:[~2003-02-05 16:47 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-02 15:18 2.4.21-pre4: tg3 driver problems with shared interrupts Stephan von Krawczynski
2003-02-02 16:49 ` Jeff Garzik
2003-02-02 17:09 ` Stephan von Krawczynski
2003-02-02 17:15 ` Jeff Garzik
2003-02-02 17:52 ` Stephan von Krawczynski
2003-02-02 18:28 ` Jeff Garzik
2003-02-02 18:31 ` Stephan von Krawczynski
2003-02-03 10:25 ` Stephan von Krawczynski
2003-02-05 9:48 ` 2.4.21-pre4: PDC ide " Stephan von Krawczynski
2003-02-05 11:16 ` Benjamin Herrenschmidt
2003-02-05 11:39 ` Stephan von Krawczynski
2003-02-05 12:21 ` Alan Cox
2003-02-05 12:22 ` Benjamin Herrenschmidt
2003-02-05 12:50 ` Alan Cox
2003-02-05 13:19 ` Stephan von Krawczynski
2003-02-05 12:24 ` Alan Cox
2003-02-05 16:56 ` Ross Biro [this message]
2003-02-05 17:12 ` Benjamin Herrenschmidt
2003-02-05 17:19 ` Ross Biro
2003-02-05 17:34 ` Benjamin Herrenschmidt
2003-02-05 17:38 ` Stephan von Krawczynski
[not found] ` <1044467091.685.155.camel@zion.wanadoo.fr>
2003-02-05 17:58 ` Stephan von Krawczynski
2003-02-05 20:00 ` Bryan Andersen
2003-02-05 19:10 ` Alan Cox
2003-02-06 12:20 ` Stephan von Krawczynski
2003-02-06 23:04 ` Benjamin Herrenschmidt
2003-02-07 9:10 ` Stephan von Krawczynski
-- strict thread matches above, loose matches on Subject: below --
2003-02-05 16:44 Robbert Kouprie
2003-02-05 19:45 ` Bryan Andersen
[not found] <7b263321.0302140626.2ddb7980@posting.google.com>
2003-02-14 14:41 ` Edward King
2003-02-14 15:41 ` Benjamin Herrenschmidt
[not found] <20030202153009$2e0d@gated-at.bofh.it>
[not found] ` <20030205181006$107c@gated-at.bofh.it>
[not found] ` <20030205181006$7bb8@gated-at.bofh.it>
[not found] ` <20030205181006$455c@gated-at.bofh.it>
[not found] ` <20030205181006$5dba@gated-at.bofh.it>
[not found] ` <20030205181006$3358@gated-at.bofh.it>
[not found] ` <200302061451.h16Epl0Z001134@pc.skynet.be>
2003-02-23 14:33 ` Stephan von Krawczynski
2003-02-23 15:04 ` Arjan van de Ven
2003-02-23 17:29 ` Stephan von Krawczynski
[not found] <3F1C54A8.5020404@snarkhunter.com>
2003-07-22 14:44 ` Edward King
2003-07-22 18:07 ` John V. Martinez
2003-07-22 21:02 ` Edward King
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