From: Alan Cox <alan@redhat.com>
Date: Thu, 15 Jan 2009 13:30:25 +0000 (+0000)
Subject: tty: Fix race in the flush for some ldiscs
X-Git-Tag: v2.6.29-rc2~75
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0253eec2a8e1140dd9672a1efe095cdcf5811d0;p=pandora-kernel.git

tty: Fix race in the flush for some ldiscs

If you issue an ioctl to flush a tty as the line discipline is changing or
otherwise unplugged you can get a crash. The bug is very old but the rest
of the BKL lock dropping and some very "good" luck on Ingo's part caught
an example.

Use the correct ldisc_ref form so that we wait for the ldisc change to
complete and then flush

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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