1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 1ab2a6191013..77ef4c481f3c 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1783,6 +1783,10 @@ static int ftdi_set_bitmode(struct usb_serial_port *port, u8 mode)
         int result;
         u16 val;
 
+        result = usb_autopm_get_interface(serial->interface);
+        if (result)
+                return result;
+
         val = (mode << 8) | (priv->gpio_output << 4) | priv->gpio_value;
         result = usb_control_msg(serial->dev,
                                  usb_sndctrlpipe(serial->dev, 0),
@@ -1795,6 +1799,8 @@ static int ftdi_set_bitmode(struct usb_serial_port *port, u8 mode)
                         val, result);
         }
 
+        usb_autopm_put_interface(serial->interface);
+
         return result;
 }
 
@@ -1846,9 +1852,15 @@ static int ftdi_read_cbus_pins(struct usb_serial_port *port)
         unsigned char *buf;
         int result;
 
+        result = usb_autopm_get_interface(serial->interface);
+        if (result)
+                return result;
+
         buf = kmalloc(1, GFP_KERNEL);
-        if (!buf)
+        if (!buf) {
+                usb_autopm_put_interface(serial->interface);
                 return -ENOMEM;
+        }
 
         result = usb_control_msg(serial->dev,
                                  usb_rcvctrlpipe(serial->dev, 0),
@@ -1863,6 +1875,7 @@ static int ftdi_read_cbus_pins(struct usb_serial_port *port)
         }
 
         kfree(buf);
+        usb_autopm_put_interface(serial->interface);
 
         return result;
 }