From: Dave Jiang <dave.jiang@intel.com>
Date: Wed, 5 Sep 2012 23:35:44 +0000 (-0700)
Subject: [SCSI] isci: Fix interrupt coalescing assumption of active TCs
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~38^2^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44ef2bf72df34ef2628dc3475b4507ab984d6744;p=pandora-kernel.git

[SCSI] isci: Fix interrupt coalescing assumption of active TCs

We always assign a dummy task context to a port in order to address a
silicon issue. We have 4 ports per controller. So when idle, there are always
exactly 4 TCs "active". The adaptive interrupt coalescing code uses number of
active TCs to figure out the coalescing values. However, we never hit "0" TCs
because of the 4 dummy TCs. Putting in fix so that we calculate this correctly.

Reported-by: Dan Melnic <dan@seamicro.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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