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Message-ID: <4677F881.6060200@rtr.ca>
Date: Tue, 19 Jun 2007 11:38:41 -0400
From: Mark Lord <lkml@....ca>
To: Sergei Shtylyov <sshtylyov@...mvista.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>,
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
Sergei Shtylyov wrote:
> 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 -> ...
>
> Indeed... but the thing is we don't know what's asserted in this case
> -- remember, it's reading the status register that locks everything up...
Exactly. And IORDY shouldn't really apply there,
unless some nitwit standards person wrote it into a spec..
-ml
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