[PATCH] Input: Optimize Event Filter functionality

[Anshul Garg <aksgarg1989@gmail.com>]

From: Anshul Garg <aksgarg1989@gmail.com>

As input_pass_values function is called everytime when EV_SYN is sent
from input driver or input event buffer becomes full.
So in case of regular handler event filter code should not run so added
check whether handler supports filter or not.

Signed-off-by: Anshul Garg <anshul.g@samsung.com>
---
 drivers/input/input.c |   24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 213e3a1..de55279 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -100,23 +100,24 @@ static unsigned int input_to_handler(struct input_handle *handle,
 	struct input_value *end = vals;
 	struct input_value *v;
 
-	for (v = vals; v != vals + count; v++) {
-		if (handler->filter &&
-		    handler->filter(handle, v->type, v->code, v->value))
-			continue;
-		if (end != v)
-			*end = *v;
-		end++;
+	if (handler->filter) {
+		for (v = vals; v != vals + count; v++) {
+			if (handler->filter(handle, v->type, v->code, v->value))
+				continue;
+			if (end != v)
+				*end = *v;
+			end++;
+		}
+		count = end - vals;
 	}
 
-	count = end - vals;
 	if (!count)
 		return 0;
 
 	if (handler->events)
 		handler->events(handle, vals, count);
 	else if (handler->event)
-		for (v = vals; v != end; v++)
+		for (v = vals; v != vals + count; v++)
 			handler->event(handle, v->type, v->code, v->value);
 
 	return count;
@@ -143,8 +144,11 @@ static void input_pass_values(struct input_dev *dev,
 		count = input_to_handler(handle, vals, count);
 	} else {
 		list_for_each_entry_rcu(handle, &dev->h_list, d_node)
-			if (handle->open)
+			if (handle->open) {
 				count = input_to_handler(handle, vals, count);
+				if (!count)
+					break;
+			}
 	}
 
 	rcu_read_unlock();
-- 
1.7.9.5


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