linux-kernel - Re: [PATCH] libata drain fifo on stuck DRQ HSM violation

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Date:	Fri, 28 Sep 2007 21:05:55 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Mark Lord <liml@....ca>, Tejun Heo <htejun@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	michal.k.k.piotrowski@...il.com, bryan@...ores.ca,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH] libata drain fifo on stuck DRQ HSM violation

Alan Cox wrote:
>> Drain up to 512 words from host/bridge FIFO on stuck DRQ HSM violation,
>> rather than just getting stuck there forever.
> 
> Why 512 words ?

Though I have queued Mark's patch to be applied, my gut feeling would 
lean towards a single DRQ block, rather than 512.


>>  	ata_altstatus(ap);
>> -	ata_chk_status(ap);
>> +	ata_drain_fifo(ap, qc);
> 
> ap->ops->cleanup();
> 
> might be wiser

If someone needs that, they can override the error handler with their 
own.  No need for a new op.

	Jeff


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