From: Ming Lei <tom.leiming@gmail.com>
Date: Tue, 26 Mar 2013 02:49:55 +0000 (+0800)
Subject: USB: serial: fix hang when opening port
X-Git-Tag: v3.9-rc5~12^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eba0e3c3a0ba7b96f01cbe997680f6a4401a0bfc;p=pandora-kernel.git

USB: serial: fix hang when opening port

Johan's 'fix use-after-free in TIOCMIWAIT' patchset[1] introduces
one bug which can cause kernel hang when opening port.

This patch initialized the 'port->delta_msr_wait' waitqueue head
to fix the bug which is introduced in 3.9-rc4.

[1], http://marc.info/?l=linux-usb&m=136368139627876&w=2

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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