From: Tejun Heo <tj@kernel.org>
Date: Mon, 7 Jun 2010 13:15:08 +0000 (+0200)
Subject: ahci: redo stopping DMA engines on empty ports
X-Git-Tag: v2.6.35-rc3~30^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ee719527229fa86ace8e3abccae3c2a8bbfd6db;p=pandora-kernel.git

ahci: redo stopping DMA engines on empty ports

Commit 96d60303fd (ahci: Turn off DMA engines when there's no device)
implemented stopping DMA engines on empty ports but it used single
sampling of status registers to determine device presence which led to
disabling of DMA engines on occupied ports.  Do it after all EH
actions are complete using device presence state determined by EH.
This avoids spurious disabling of DMA engines and simplifies the code.

Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Robert Hancock <hancockrwd@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---

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