From: Tejun Heo <htejun@gmail.com>
Date: Tue, 20 Feb 2007 14:31:22 +0000 (+0900)
Subject: libata: fix ata_scsi_change_queue_depth()
X-Git-Tag: v2.6.21-rc2~25^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3c70c443c2ef1fce31f201a93780c884b903993;p=pandora-kernel.git

libata: fix ata_scsi_change_queue_depth()

Fix ata_scsi_change_queue_depth() such that...

* NCQ on/off is exactly determined using the same logic as the issue path.

* queue depth is adjusted to 1 if NCQ is not enabled.

* -EINVAL is returned if requested action is ignored due to limitations.

This fixes the bug which allows queue depth to be increased on
blacklisted NCQ hosts/devices.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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