From: Henrik Rydberg <rydberg@euromail.se>
Date: Sat, 1 Sep 2012 19:47:11 +0000 (+0200)
Subject: HID: Only dump input if someone is listening
X-Git-Tag: v3.6-rc5~3^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bfc8da00b1e74f55a52cc06a0d364f1f7f61ed8;p=pandora-kernel.git

HID: Only dump input if someone is listening

Going through the motions of printing the debug message information
takes a long time; using the keyboard can lead to a 160 us irqsoff
latency. This patch skips hid_dump_input() when there are no open
handles, which brings latency down to 100 us.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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