From: Alan Stern <stern@rowland.harvard.edu>
Date: Fri, 8 Jan 2010 17:57:02 +0000 (-0500)
Subject: USB: change handling of negative autosuspend delays
X-Git-Tag: v2.6.34-rc1~215^2~109
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5899f1e020c8d53b2b6fbd6a6cf39c891ccdfade;p=pandora-kernel.git

USB: change handling of negative autosuspend delays

This patch (as1327) changes the way negative autosuspend delays
prevent device from autosuspending.  The current code checks for
negative values explicitly in the autosuspend_check() routine.  The
updated code keeps things from getting that far by using
usb_autoresume_device() to increment the usage counter when a negative
delay is set, and by using usb_autosuspend_device() to decrement the
usage counter when a non-negative delay is set.

This complicates the set_autosuspend() attribute method code slightly,
but it will reduce the overall power management overhead.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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