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From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Tejun Heo <htejun@gmail.com>
Subject: Re: ATA device reset, shoud I be concerned?
Date: Tue, 22 Jan 2008 02:31:22 +0100
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Andrew Morton <akpm@linux-foundation.org>,
       Georgi Chulkov <g.chulkov@jacobs-university.de>,
       linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
       Mark Lord <liml@rtr.ca>
References: <200801140019.20668.g.chulkov@jacobs-university.de> <20080121164744.2f7d0ed1@lxorguk.ukuu.org.uk> <4794D020.4060204@gmail.com>
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On Monday 21 January 2008, Tejun Heo wrote:

[...]

> > Old IDE says it works for PATA. For SATA I can see it might need more
> > care and you might simply not be able to get the info.
> 
> Old IDE often locks up the machine hard after timeouts.  I'm all for

Could you point me to some bugreports?

I would like to know more about hosts/conditions for which it happens.

> gathering more info but benefit vs. risk equation just doesn't look good
> here.  Why take risk for a rare device which forgets to raise IRQ on
> media error?  If such behavior is wide spread among PATA drives && we
> can verify that TF register access after timeout is safe for PATA
> controllers, sure, but currently we aren't sure about either.

Thanks,
Bart