Input: move name/timer init to input_alloc_dev()

We want to allow drivers to call input_event() at any time after the
device got allocated. This means input_event() and input_register_device()
must be allowed to run in parallel.

The only conflicting calls in input_register_device() are init_timer() and
dev_set_name(). Both can safely be moved to device allocation and we're
good to go.

Signed-off-by: David Herrmann <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/input.c

···
  */
 struct input_dev *input_allocate_device(void)
 {
+	static atomic_t input_no = ATOMIC_INIT(0);
 	struct input_dev *dev;
 
 	dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
···
 		device_initialize(&dev->dev);
 		mutex_init(&dev->mutex);
 		spin_lock_init(&dev->event_lock);
+		init_timer(&dev->timer);
 		INIT_LIST_HEAD(&dev->h_list);
 		INIT_LIST_HEAD(&dev->node);
+
+		dev_set_name(&dev->dev, "input%ld",
+			     (unsigned long) atomic_inc_return(&input_no) - 1);
 
 		__module_get(THIS_MODULE);
 	}
···
  */
 int input_register_device(struct input_dev *dev)
 {
-	static atomic_t input_no = ATOMIC_INIT(0);
 	struct input_devres *devres = NULL;
 	struct input_handler *handler;
 	unsigned int packet_size;
···
 	 * If delay and period are pre-set by the driver, then autorepeating
 	 * is handled by the driver itself and we don't do it in input.c.
 	 */
-	init_timer(&dev->timer);
 	if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 		dev->timer.data = (long) dev;
 		dev->timer.function = input_repeat_key;
···
 
 	if (!dev->setkeycode)
 		dev->setkeycode = input_default_setkeycode;
-
-	dev_set_name(&dev->dev, "input%ld",
-		     (unsigned long) atomic_inc_return(&input_no) - 1);
 
 	error = device_add(&dev->dev);
 	if (error)