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Subject[089/136] tty: USB hangup is racy
2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Alan Cox <alan@linux.intel.com>
commit d2b391822a11302add9e46476f3da4e18e6de84c upstream.

The USB layer uses tty_hangup to deal with unplugs of the physical hardware
(analogous to loss of carrier) and then frees the resources. However the
tty_hangup is asynchronous. As the hangup can sleep we can use tty_vhangup
which is the non async version to avoid freeing resources too early.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/usb/serial/usb-serial.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1161,10 +1161,7 @@ void usb_serial_disconnect(struct usb_in
if (port) {
struct tty_struct *tty = tty_port_tty_get(&port->port);
if (tty) {
- /* The hangup will occur asynchronously but
- the object refcounts will sort out all the
- cleanup */
- tty_hangup(tty);
+ tty_vhangup(tty);
tty_kref_put(tty);
}
kill_traffic(port);



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