[PATCH 3.2 028/125] USB: option: fix runtime PM handling

Ben Hutchings
2014-07-08T19:17:10Z

From: Johan Hovold <jhovold@gmail.com>

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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -1955,6 +1955,7 @@ static int option_send_setup(struct usb_
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,
@@ -1970,9 +1971,16 @@ static int option_send_setup(struct usb_
if (portdata->rts_state)
val |= 0x02;

- return usb_control_msg(serial->dev,
- usb_rcvctrlpipe(serial->dev, 0),
+ 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);