From: Shaohua Li <shaohua.li@intel.com>
Date: Tue, 27 Oct 2009 07:46:23 +0000 (+0100)
Subject: cfq-iosched: improve hw_tag detection
X-Git-Tag: v2.6.33-rc1~379^2~84
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a1238a7dd48e48b3bba8f426a1d61c22c80d6d1;p=pandora-kernel.git

cfq-iosched: improve hw_tag detection

If active queue hasn't enough requests and idle window opens, cfq will not
dispatch sufficient requests to hardware. In such situation, current code
will zero hw_tag. But this is because cfq doesn't dispatch enough requests
instead of hardware queue doesn't work. Don't zero hw_tag in such case.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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