linux-kernel - Re: [PATCH v2.6.38-rc7] Revert "libata: ahci_start

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Date:	Mon, 16 May 2011 13:02:17 -0400
From:	Valdis.Kletnieks@...edu
To:	Tejun Heo <tj@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	Michael Leun <lkml20100708@...ton.leun.net>,
	linux-ide@...r.kernel.org,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Jian Peng <jipeng2005@...il.com>
Subject: Re: [PATCH v2.6.38-rc7] Revert "libata: ahci_start_engine compliant to AHCI spec"

On Sat, 14 May 2011 12:28:04 +0200, Tejun Heo said:
> This reverts commit 270dac35c26433d06a89150c51e75ca0181ca7e4.
> 
> The commits causes command timeouts on AC plug/unplug.  It isn't yet
> clear why.  As the commit was for a single rather obscure controller,
> revert the change for now.
> 
> The problem was reported and bisected by Gu Rui in bug#34692.
> 
>  https://bugzilla.kernel.org/show_bug.cgi?id=34692
> 
> Also, reported by Rafael and Michael in the following thread.
> 
>  http://thread.gmane.org/gmane.linux.kernel/1138771

This also fixes the issue I had with a 10-second pause on my Dell Latitude E6500
laptop at boot while detecting the CD/DVD drive.

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