Input: usbtouchscreen - initialize PM mutex before using it

Mutexes shall be initialized before they are used.

Fixes: 12e510d ("Input: usbtouchscreen - fix deadlock in autosuspend")
Reported-by: [email protected]
Signed-off-by: Oliver Neukum <[email protected]>
Cc: [email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: oneukum

drivers/input/touchscreen/usbtouchscreen.c

@@ -1659,6 +1659,8 @@ static int usbtouch_probe(struct usb_interface *intf,
 	if (!usbtouch || !input_dev)
 		goto out_free;
 
+	mutex_init(&usbtouch->pm_mutex);
+
 	type = &usbtouch_dev_info[id->driver_info];
 	usbtouch->type = type;
 	if (!type->process_pkt)