[PATCH] USB: add ability for usb-serial drivers to determine if their write urb is currently being used.

This removes a lot of racy and buggy code by trying to check the status of the urb.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 5da76dd8fb28..0267b26dde18 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1047,6 +1047,7 @@ int usb_serial_probe(struct usb_interface *interface,
                 memset(port, 0x00, sizeof(struct usb_serial_port));
                 port->number = i + serial->minor;
                 port->serial = serial;
+                spin_lock_init(&port->lock);
                 INIT_WORK(&port->work, usb_serial_port_softint, port);
                 serial->port[i] = port;
         }