Input: uinput - add a schedule point in uinput_inject_events()

Large writes to uinput interface may cause rcu stalls. Let's add
cond_resched() to the loop to avoid this.
Reviewed-by: NPaul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/uinput.c

@@ -598,6 +598,7 @@ static ssize_t uinput_inject_events(struct uinput_device *udev,
 
 		input_event(udev->dev, ev.type, ev.code, ev.value);
 		bytes += input_event_size();
+		cond_resched();
 	}
 
 	return bytes;