linux-kernel - Re: [BUG] ide dma_timer

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Message-ID: <20070618204601.GF5836@austin.ibm.com>
Date:	Mon, 18 Jun 2007 15:46:01 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup

On Mon, Jun 18, 2007 at 09:27:04PM +0100, Alan Cox wrote:
> > ide_dma_timeout_retry() in ide-io.c 
> >   prints the "hdc: DMA Timeout error" then calls
> >   HWIF(drive)->ide_dma_end(drive);
> >     which returns, and then calls 
> >   hwif->INB(IDE_STATUS_REG) which is needed as an argument to ide_error()
> > 
> > But this hangs! -- The INB never returns.
> > Now:  hwif->INB = ide_inb; in ide-iops.c
> 
> Yep and the I/O cycle never completes so the box hangs. This occurs if
> the drive blows up and never switches IORDY to indicate completion. The
> hpt will also do this sometimes if it gets addled by a confused drive,
> while an intel one often won't.

So what do you suggest? (I could buy an alternate ide controller,
and hope that goes away, or just buy a different hard drive. But
that's beside the point).

I can prepare a patch, but only with a lot of guidance. I can test 
& debug, I'm highly motivated just right now ... 

--linas
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