tree 8b528be0d99bb136c9eb2b21d97c151440c701f4
parent f7ac7787ad361e31a7972e2854ed8dc2eedfac3b
author Lan Tianyu <tianyu.lan@intel.com> 1346823877 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1347307441 -0700

usb: Fail a get config when the port is powered off.

Alan Stern pointed out that a USB port could potentially get powered off
when the attached USB device is in the middle of enumerating, due to
race conditions:
	http://marc.info/?l=linux-usb&m=134130616707548&w=2

If that happens, we need to ensure the enumeration fails.  If a call to
usb_get_descriptor() fails for a reason other than a Stall, return an
error.  That should handle the case where the port is powered off.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>