From: Philippe Rétornaz <philippe.retornaz@epfl.ch>
Date: Wed, 27 Oct 2010 15:13:21 +0000 (+0200)
Subject: tty_ldisc: Fix BUG() on hangup
X-Git-Tag: v2.6.37-rc2~24^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c95ba1e1de7edffc0c4e275e147f1a9eb1f81ae;p=pandora-kernel.git

tty_ldisc: Fix BUG() on hangup

A kernel BUG when bluetooth rfcomm connection drop while the associated
serial port is open is sometime triggered.

It seems that the line discipline can disappear between the
tty_ldisc_put and tty_ldisc_get. This patch fall back to the N_TTY line
discipline if the previous discipline is not available anymore.

Signed-off-by: Philippe Retornaz <philippe.retornaz@epfl.ch>
Acked-by: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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