usb: don't check pm qos NO_POWER_OFF flag in usb_port_suspend()
authorLan Tianyu <tianyu.lan@intel.com>
Wed, 3 Jul 2013 14:17:54 +0000 (22:17 +0800)
committerSarah Sharp <sarah.a.sharp@linux.intel.com>
Thu, 15 Aug 2013 17:52:33 +0000 (10:52 -0700)
commit98a4f1ff7bea8002ab79d6776e30d27932e88244
tree4f8b6a6273cab2f53cd0903717f28b6b5f4e27b0
parentaa5ceae24bf8dff1d6fe87c6c4b08e69c6d33550
usb: don't check pm qos NO_POWER_OFF flag in usb_port_suspend()

The pm qos NO_POWER_OFF flag is checked twice during usb device suspend
to see if the usb port power off condition is met. This is redundant and
also will prevent the port from being powered off if the NO_POWER_OFF
flag is changed to 1 from 0 after the device was already suspended.

More detail in the following link.
http://marc.info/?l=linux-usb&m=136543949130865&w=2

This patch should be backported to kernels as old as 3.7, that
contain the commit f7ac7787ad361e31a7972e2854ed8dc2eedfac3b "usb/acpi:
Use ACPI methods to power off ports."

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
drivers/usb/core/hub.c