usbcore: enable USB2 LPM if port suspend fails
USB2 LPM is disabled when device begin to suspend and enabled after device is resumed. That's because USB spec does not define the transition from U1/U2 state to U3 state. If usb_port_suspend() fails, usb_port_resume() is never called, and USB2 LPM is disabled in this situation. Enable USB2 LPM if port suspend fails. This patch should be backported to kernels as old as 3.2, that contain the commit 65580b43 "xHCI: set USB2 hardware LPM". Signed-off-by: NAndiry Xu <andiry.xu@gmail.com> Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@vger.kernel.org
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