From: Oliver Neukum Date: Fri, 17 Aug 2007 12:01:38 +0000 (+0200) Subject: USB: fix errornous assumption in the usb serial framework revealed by iuu_phoenix X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=5adceac5da3d353dd1318d0482cab94a79472adf;p=openwrt%2Fstaging%2Fblogic.git USB: fix errornous assumption in the usb serial framework revealed by iuu_phoenix the iuu_phoenix driver submits another URB from a completion handler. This dictates a certain order of calls to usb_kill_urb() in kill_traffic(). As other drivers may do it the other way round, we need to use both orders in kill_traffic(). This patch does so and should be merged before iuu_phoenix is merged. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 9bf01a5efc84..26e015c39a31 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -578,6 +578,17 @@ static void kill_traffic(struct usb_serial_port *port) { usb_kill_urb(port->read_urb); usb_kill_urb(port->write_urb); + /* + * This is tricky. + * Some drivers submit the read_urb in the + * handler for the write_urb or vice versa + * this order determines the order in which + * usb_kill_urb() must be used to reliably + * kill the URBs. As it is unknown here, + * both orders must be used in turn. + * The call below is not redundant. + */ + usb_kill_urb(port->read_urb); usb_kill_urb(port->interrupt_in_urb); usb_kill_urb(port->interrupt_out_urb); }