USB: serial: fix console error reporting

Do not report errors in write path if port is used as a console as this
may trigger the same error (and error report) resulting in a loop.

Reported-by: Stephen Hemminger <shemminger@vyatta.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index f7403576f99..e129fcd69fd 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -217,8 +217,10 @@ retry:
         clear_bit(i, &port->write_urbs_free);
         result = usb_submit_urb(urb, GFP_ATOMIC);
         if (result) {
-                dev_err(&port->dev, "%s - error submitting urb: %d\n",
+                if (!port->port.console) {
+                        dev_err(&port->dev, "%s - error submitting urb: %d\n",
                                                 __func__, result);
+                }
                 set_bit(i, &port->write_urbs_free);
                 spin_lock_irqsave(&port->lock, flags);
                 port->tx_bytes -= count;