linux-kernel - Re: [BUG] ide dma_timer

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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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