From: Anshul Garg <anshul.g@samsung.com>
Date: Sat, 13 Dec 2014 19:58:23 +0000 (-0800)
Subject: Input: optimize events_per_packet count calculation
X-Git-Tag: firefly_0821_release~176^2~541^2~111^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=baf332c0f1cede26e9c2af6276b36b4c3a36e34a;p=firefly-linux-kernel-4.4.55.git

Input: optimize events_per_packet count calculation

This patch avoids unnecessary operations while estimating events per
packet for an input device when event type is not set.

Signed-off-by: Anshul Garg <anshul.g@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 04217c2e345c..213e3a1903ee 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1974,18 +1974,22 @@ static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
 
 	events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
 
-	for (i = 0; i < ABS_CNT; i++) {
-		if (test_bit(i, dev->absbit)) {
-			if (input_is_mt_axis(i))
-				events += mt_slots;
-			else
-				events++;
+	if (test_bit(EV_ABS, dev->evbit)) {
+		for (i = 0; i < ABS_CNT; i++) {
+			if (test_bit(i, dev->absbit)) {
+				if (input_is_mt_axis(i))
+					events += mt_slots;
+				else
+					events++;
+			}
 		}
 	}
 
-	for (i = 0; i < REL_CNT; i++)
-		if (test_bit(i, dev->relbit))
-			events++;
+	if (test_bit(EV_REL, dev->evbit)) {
+		for (i = 0; i < REL_CNT; i++)
+			if (test_bit(i, dev->relbit))
+				events++;
+	}
 
 	/* Make room for KEY and MSC events */
 	events += 7;