linux-kernel - Re: [BUG] ide dma_timer

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Date:	Tue, 19 Jun 2007 18:24:38 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

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...

> Alan

MBR, Sergei
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