linux-kernel - Re: Proposed changes for libata speed handling

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Message-ID: <45AB8738.6090405@garzik.org>
Date:	Mon, 15 Jan 2007 08:52:56 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <htejun@...il.com>
CC:	Alan <alan@...rguk.ukuu.org.uk>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Proposed changes for libata speed handling

BTW, for a solution to be complete, we need to halt all work on all 
other ports, when issuing SET FEATURES - XFER MODE.  On SiI and Promise 
controllers, possibly others, the command is snooped and side effects 
such as register setting occur.

Long standing to-do.  Currently we hack around this by serializing the 
bus probe, and preventing people from issuing SET FEATURES - XFER MODE 
from userspace.

	Jeff

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