Input: evdev - fix bug in checking duplicate clock change request

clk_type and clkid stores different predefined clock identification
values so they cannot be compared for checking duplicate clock change
request. Therefore, lets fix it to avoid unexpected results.
Signed-off-by: Aniroop Mathur <a.mathur@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/evdev.c

@@ -56,7 +56,7 @@ struct evdev_client {
 	struct fasync_struct *fasync;
 	struct evdev *evdev;
 	struct list_head node;
-	int clk_type;
+	unsigned int clk_type;
 	bool revoked;
 	unsigned long *evmasks[EV_CNT];
 	unsigned int bufsize;
@@ -191,25 +191,26 @@ static void evdev_queue_syn_dropped(struct evdev_client *client)
 static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
 {
 	unsigned long flags;
-
-	if (client->clk_type == clkid)
-		return 0;
+	unsigned int clk_type;
 
 	switch (clkid) {
 
 	case CLOCK_REALTIME:
-		client->clk_type = EV_CLK_REAL;
+		clk_type = EV_CLK_REAL;
 		break;
 	case CLOCK_MONOTONIC:
-		client->clk_type = EV_CLK_MONO;
+		clk_type = EV_CLK_MONO;
 		break;
 	case CLOCK_BOOTTIME:
-		client->clk_type = EV_CLK_BOOT;
+		clk_type = EV_CLK_BOOT;
 		break;
 	default:
 		return -EINVAL;
 	}
 
+	if (client->clk_type != clk_type) {
+		client->clk_type = clk_type;
+
 		/*
 		 * Flush pending events and queue SYN_DROPPED event,
 		 * but only if the queue is not empty.
@@ -222,6 +223,7 @@ static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
 		}
 
 		spin_unlock_irqrestore(&client->buffer_lock, flags);
+	}
 
 	return 0;
 }