From: Johan Hovold <jhovold@gmail.com>
Date: Thu, 21 Mar 2013 11:36:48 +0000 (+0100)
Subject: USB: fix urb-poison imbalance
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~135^2~178
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68a2bed130a10cffbf68620f41d08a900b1d776b;p=pandora-kernel.git

USB: fix urb-poison imbalance

The calls to usb_poison_urb and usb_unpoison_urb are expected to be
balanced. However, if an urb that has not yet been submitted is
poisoned, its reject counter will not be increased as its ep-field is
NULL. A consecutive call to unpoison will thus in fact poison the urb
as its reject counter will be decremented to a negative value,
effectively preventing the urb from being submitted.

Note that there are currently no in-kernel drivers affected by this.

Cc: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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