From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Date: Thu, 4 Oct 2012 16:53:43 +0000 (-0700)
Subject: USB: Enable LPM after a failed probe.
X-Git-Tag: v3.7-rc2~17^2~34^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d01f87c0ffa96cb44faa78710711eb6e974b891c;p=pandora-kernel.git

USB: Enable LPM after a failed probe.

Before a driver is probed, we want to disable USB 3.0 Link Power
Management (LPM), in case the driver needs hub-initiated LPM disabled.
After the probe finishes, we want to attempt to re-enable LPM, order to
balance the LPM ref count.

When a probe fails (such as when libusual doesn't want to bind to a USB
3.0 mass storage device), make sure to balance the LPM ref counts by
re-enabling LPM.

This patch should be backported to kernels as old as 3.5, that contain
the commit 8306095fd2c1100e8244c09bf560f97aca5a311d "USB: Disable USB
3.0 LPM in critical sections."

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
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