USB: serial: sierra driver interrupt urb resubmit fix

- Fixed a problem when re-submitting urb from interrupt callback in
  function sierra_instat_callback(). This suppresses also issuing of
  error messages in /var/log/kern.log
- Removed redundant debug message at the beginning of
  sierra_instat_callback() function
- Changed a debug message to be an error message

Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 9d11fe47633b..bcfe0ac1e221 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -556,7 +556,6 @@ static void sierra_instat_callback(struct urb *urb)
         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
         struct usb_serial *serial = port->serial;
 
-        dev_dbg(&port->dev, "%s\n", __func__);
         dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
                 urb, port, portdata);
 
@@ -600,12 +599,12 @@ static void sierra_instat_callback(struct urb *urb)
                 dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
 
         /* Resubmit urb so we continue receiving IRQ data */
-        if (status != -ESHUTDOWN) {
+        if (port->port.count && status != -ESHUTDOWN && status != -ENOENT) {
                 urb->dev = serial->dev;
                 err = usb_submit_urb(urb, GFP_ATOMIC);
                 if (err)
-                        dev_dbg(&port->dev, "%s: resubmit intr urb "
-                                "failed. (%d)\n",       __func__, err);
+                        dev_err(&port->dev, "%s: resubmit intr urb "
+                                "failed. (%d)\n", __func__, err);
         }
 }