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-rw-r--r--drivers/usb/serial/sierra.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 6aeea40081c..fcec4660355 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -594,14 +594,17 @@ static void sierra_indat_callback(struct urb *urb)
} else {
if (urb->actual_length) {
tty = tty_port_tty_get(&port->port);
-
- tty_buffer_request_room(tty, urb->actual_length);
- tty_insert_flip_string(tty, data, urb->actual_length);
- tty_flip_buffer_push(tty);
-
- tty_kref_put(tty);
- usb_serial_debug_data(debug, &port->dev, __func__,
- urb->actual_length, data);
+ if (tty) {
+ tty_buffer_request_room(tty,
+ urb->actual_length);
+ tty_insert_flip_string(tty, data,
+ urb->actual_length);
+ tty_flip_buffer_push(tty);
+
+ tty_kref_put(tty);
+ usb_serial_debug_data(debug, &port->dev,
+ __func__, urb->actual_length, data);
+ }
} else {
dev_dbg(&port->dev, "%s: empty read urb"
" received\n", __func__);