From: Alan Cox <alan@linux.intel.com>
Date: Mon, 27 Jul 2009 09:58:08 +0000 (+0100)
Subject: tty: Fix a USB serial crash/scribble
X-Git-Tag: v2.6.31-rc5~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b68f2fb9e73f46037fbeca5fbd4ae8a7ddd8ef6b;p=pandora-kernel.git

tty: Fix a USB serial crash/scribble

The port lock is used to protect the port state. However the port structure
is freed on a hangup, then the lock taken on a close. The right fix is to
drop the port on tty->shutdown() but we can't yet do that due to sleep v
non-sleeping rules. Instead do the next best thing and fix it up when we are
not in -rc season.

Reported-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Tested-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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