linux-kernel - Re: [PATCH] libata: Forcing PIO0 mode on reset must not freeze system

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Message-ID: <20080211115050.77feb1af@core>
Date:	Mon, 11 Feb 2008 11:50:50 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Tejun Heo <htejun@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	htejun@...il.com, alan@...hat.com, jeff@...zik.org
Subject: Re: [PATCH] libata: Forcing PIO0 mode on reset must not freeze
 system

> In the above example, even the reset sequence itself can cause hang if
> the hardware is implemented slightly differently.  The reason why
> set_piomode() locks up but reset sequence doesn't is simple dumb luck.
> I think the proper fix is to tell libata to detach the cdrom before
> undocking.

Just a thought but which ICH variant is this. For the older ones we have
to turn IORDY off in software before an eject and they cannot fully
support hot unplug

Alan

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