[PATCH] [usb-serial] fix Ooops on uplug

[Daniel Mack <daniel@caiaq.de>]

When an USB serial adapter is disconnected and <Enter> is pressed on a
connection still open on it (cu, minicom, ...), the kernel crashes.

The reason is that the serial port's resources are freed upon disconnect
(in serial_hangup()) but the tty device layer is not made aware of that.
Hence, the close callback will later access the resources again.

Fix that by postponing the resources freeing to the close callback and
remove it from the hangup callback.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alan Cox <alan@redhat.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oneukum@suse.de>
Cc: Alan Cox <alan@linux.intel.com>
Cc: linux-usb@vger.kernel.org
---
 drivers/usb/serial/usb-serial.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index bd7581b..77cb3cd 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -355,7 +355,6 @@ static void serial_hangup(struct tty_struct *tty)
 	struct usb_serial_port *port = tty->driver_data;
 	serial_do_down(port);
 	tty_port_hangup(&port->port);
-	serial_do_free(port);
 }
 
 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
-- 
1.6.3.1