[PATCH] Input:Flush client events on clk_type change

[Anshul Garg <aksgarg1989@gmail.com>]

From: Anshul Garg <aksgarg1989@gmail.com>

Since the client clk_type is changed , flush pending
events from client buffer and queue SYN_DROPPED event.
Added check for duplicate clk_type change request.

Signed-off-by: Anshul Garg <anshul.g@samsung.com>
---
 drivers/input/evdev.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index b1a52ab..d024fc6 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -62,8 +62,12 @@ struct evdev_client {
 	struct input_event buffer[];
 };
 
-static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
+static int evdev_set_clk_type(struct evdev_client *client,
+			struct input_dev *dev, unsigned int clkid)
 {
+	if (client->clk_type == clkid)
+		return 0;
+
 	switch (clkid) {
 
 	case CLOCK_REALTIME:
@@ -78,7 +82,17 @@ static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
 	default:
 		return -EINVAL;
 	}
+
+	spin_lock_irq(&dev->event_lock);
+	spin_lock(&client->buffer_lock);
+	spin_unlock(&dev->event_lock);
 
+	/* Flush clients events after clk_type is changed
+	 * and queue SYN_DROPPED event.*/
+	client->packet_head = client->head = client->tail;
+	spin_unlock_irq(&client->buffer_lock);
+
+	evdev_queue_syn_dropped(client);
 	return 0;
 }
 
@@ -908,7 +922,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
 		if (copy_from_user(&i, p, sizeof(unsigned int)))
 			return -EFAULT;
 
-		return evdev_set_clk_type(client, i);
+		return evdev_set_clk_type(client, dev, i);
 
 	case EVIOCGKEYCODE:
 		return evdev_handle_get_keycode(dev, p);
-- 
1.7.9.5


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