From: Jens Axboe <jens.axboe@oracle.com>
Date: Fri, 24 Oct 2008 07:22:42 +0000 (+0200)
Subject: libata: fix bug with non-ncq devices
X-Git-Tag: v2.6.28-rc2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e013e13bf605b9e6b702adffbe2853cfc60e7806;p=pandora-kernel.git

libata: fix bug with non-ncq devices

The recent commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e ("libata:
switch to using block layer tagging support") to enable support for
block layer tagging in libata was broken for non-NCQ devices

The block layer initializes the tag field to -1 to detect invalid uses
of a tag, and if the libata devices does NOT support NCQ, we just used
that field to index the internal command list.  So we need to check for
-1 first and only use the tag field if it's valid.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Tested-by: Paul Mundt <lethal@linux-sh.org>
Tested-by: Dave Young <hidave.darkstar@gmail.com>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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