linux-kernel - Re: [BUG] ide dma_timer

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Message-ID: <46780524.4010301@ru.mvista.com>
Date:	Tue, 19 Jun 2007 20:32:36 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Mark Lord <lkml@....ca>, 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:
>>>   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..

> Could it be we need to reset the state machine at this point before we
> touch the registers again - that wouldn't be the first controller with
> this limit and undocumented.

> On the 370 we already 

    Yeah, that could be. And because IORDY pin becomes DSTROBE for UltraDMA it 
might have stuck low due to this (if the chip never asserted STOP)...

> Alan

MBR, Sergei
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