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path: root/drivers/usb/serial/sierra.c
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Diffstat (limited to 'drivers/usb/serial/sierra.c')
-rw-r--r--drivers/usb/serial/sierra.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 953bdf8827d..4c925e3e8a6 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -597,7 +597,10 @@ static void sierra_close(struct usb_serial_port *port, struct file *filp)
portdata->dtr_state = 0;
if (serial->dev) {
- sierra_send_setup(port);
+ mutex_lock(&serial->disc_mutex);
+ if (!serial->disconnected)
+ sierra_send_setup(port);
+ mutex_unlock(&serial->disc_mutex);
/* Stop reading/writing urbs */
for (i = 0; i < N_IN_URB; i++)