USB-Serial: Fix error handling of usb_wwan

This fixes an issue where the bulk-in urb used for incoming data transfer
is not resubmitted if the packet recieved contains an error status.  This
results in the driver locking until the port is closed and re-opened.

Tested on a custom board with a Cinterion GSM module.

Signed-off-by: Matt Burtch <matt@grid-net.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 8257d30..8536578 100644 (file)
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -291,18 +291,18 @@ static void usb_wwan_indat_callback(struct urb *urb)
                        tty_flip_buffer_push(&port->port);
                } else
                        dev_dbg(dev, "%s: empty read urb received\n", __func__);
-
-               /* Resubmit urb so we continue receiving */
-               err = usb_submit_urb(urb, GFP_ATOMIC);
-               if (err) {
-                       if (err != -EPERM) {
-                               dev_err(dev, "%s: resubmit read urb failed. (%d)\n", __func__, err);
-                               /* busy also in error unless we are killed */
-                               usb_mark_last_busy(port->serial->dev);
-                       }
-               } else {
+       }
+       /* Resubmit urb so we continue receiving */
+       err = usb_submit_urb(urb, GFP_ATOMIC);
+       if (err) {
+               if (err != -EPERM) {
+                       dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
+                               __func__, err);
+                       /* busy also in error unless we are killed */
                        usb_mark_last_busy(port->serial->dev);
                }
+       } else {
+               usb_mark_last_busy(port->serial->dev);
        }
 }