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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>
This commit is contained in:
Ming Lei 2013-03-26 10:49:55 +08:00 committed by Greg Kroah-Hartman
parent 85ecd0322b
commit eba0e3c3a0
1 changed files with 1 additions and 0 deletions
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1
drivers/usb/serial/usb-serial.c
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@ -903,6 +903,7 @@ static int usb_serial_probe(struct usb_interface *interface,
port->port.ops = &serial_port_ops;
port->serial = serial;
spin_lock_init(&port->lock);
init_waitqueue_head(&port->delta_msr_wait);
/* Keep this for private driver use for the moment but
should probably go away */
INIT_WORK(&port->work, usb_serial_port_work);