USB: option: fix runtime PM handling

commit acf47d4f9c39b1cba467aa9442fc2efe0b1da741 upstream.

Fix potential I/O while runtime suspended due to missing PM operations
in send_setup.

Fixes: 383cedc3bb43 ("USB: serial: full autosuspend support for the
option driver")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index def9ed0..f7ccfbc 100644 (file)
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -1930,6 +1930,7 @@ static int option_send_setup(struct usb_serial_port *port)
        struct usb_wwan_port_private *portdata;
        int ifNum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
        int val = 0;
+       int res;
        dbg("%s", __func__);
 
        if (is_blacklisted(ifNum, OPTION_BLACKLIST_SENDSETUP,
@@ -1945,9 +1946,17 @@ static int option_send_setup(struct usb_serial_port *port)
        if (portdata->rts_state)
                val |= 0x02;
 
-       return usb_control_msg(serial->dev,
-               usb_rcvctrlpipe(serial->dev, 0),
-               0x22, 0x21, val, ifNum, NULL, 0, USB_CTRL_SET_TIMEOUT);
+       res = usb_autopm_get_interface(serial->interface);
+       if (res)
+               return res;
+
+       res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+                               0x22, 0x21, val, ifNum, NULL,
+                               0, USB_CTRL_SET_TIMEOUT);
+
+       usb_autopm_put_interface(serial->interface);
+
+       return res;
 }
 
 MODULE_AUTHOR(DRIVER_AUTHOR);