Some devices (ex Nokia C7) simply don't respond at all when data is sent
to some of their USB interfaces.  The data gets stuck in the TTYs queue
and sits there until close(2), which them blocks because closing_wait
defaults to 30 seconds (even though the fd is O_NONBLOCK).  This is
rarely desired.  Implement the standard mechanism to adjust closing_wait
and let applications handle it how they want to.

See also 02303f73 for usb_wwan.c.
Signed-off-by: NDan Williams <dcbw@redhat.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: NOliver Neukum <oneukum@suse.de>
Tested-by: NAleksander Morgado <aleksander@gnu.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>