From: Lan Tianyu <tianyu.lan@intel.com>
Date: Wed, 5 Sep 2012 05:44:37 +0000 (+0800)
Subject: usb: Fail a get config when the port is powered off.
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~73^2~145
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a22b872e923954853cabd5a18f41da1846bccdb;p=pandora-kernel.git

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>
---

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