From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 1 Jun 2010 20:53:06 +0000 (+0200)
Subject: tty: reorder ldisc locking
X-Git-Tag: v2.6.36-rc1~294^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60af22d2ed490554cc92c8d0fed0b5b9cf687568;p=pandora-kernel.git

tty: reorder ldisc locking

We need to release the BTM in paste_selection() when
sleeping in tty_ldisc_ref_wait to avoid deadlocks
with tty_ldisc_enable.

In tty_set_ldisc, we now always grab the BTM before
taking the ldisc_mutex in order to avoid AB-BA
deadlocks between the two.

tty_ldisc_halt potentially blocks on a workqueue
function that takes the BTM, so we must release
the BTM before calling it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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