linux-kernel - Re: [BUG] ide dma_timer

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Date:	Tue, 19 Jun 2007 15:19:19 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Linas Vepstas <linas@...tin.ibm.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup

On Tue, 19 Jun 2007 18:10:04 +0400
Sergei Shtylyov <sshtylyov@...mvista.com> wrote:

> Hello.
> 
> Alan Cox wrote:
> >>I can prepare a patch, but only with a lot of guidance. I can test 
> >>& debug, I'm highly motivated just right now ... 
> 
> > If you've got a nice repeatable problem please try using the libata
> > driver. That handles the error paths differently and doesn't try a FIFO
> > drain which might matter in this case I guess.
> 
>     FIFO drain for DMA commands?

Welcome to the old IDE layer which I am so glad I left behind 8)

ide_ata_error will try and do a PIO flush regardless of the command type
if DRQ_STAT is asserted. See ide_dma_intr -> ide_error -> ...

Alan
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