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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