From: Clemens Ladisch <clemens@ladisch.de>
Date: Thu, 24 May 2012 17:29:19 +0000 (+0200)
Subject: firewire: ohci: lazy bus time initialization
X-Git-Tag: v3.6-rc1~65^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9d60ef2bd87f201c509cfae13ba6c9013446673d;p=pandora-kernel.git

firewire: ohci: lazy bus time initialization

The Bus_Time CSR is virtually never used, so we can avoid burning CPU in
interrupt context for 1 or 3 IsochronousCycleTimer accesses every minute
by not tracking the bus time until the CSR is actually accessed for the
first time.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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