From e43af30720dd7294a1370a16ed58146381a42d7d Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Fri, 6 Jan 2017 19:15:13 +0100
Subject: [PATCH] USB: serial: ch341: fix open error handling

commit f2950b78547ffb8475297ada6b92bc2d774d5461 upstream.

Make sure to stop the interrupt URB before returning on errors during
open.

Fixes: 664d5df92e88 ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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