Patch "Input: do not emit unneeded EV_SYN when suspending" has been added to the 3.18-stable tree

Patch "Input: do not emit unneeded EV_SYN when suspending" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Input: do not emit unneeded EV_SYN when suspending

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     input-do-not-emit-unneeded-ev_syn-when-suspending.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 00159f19a5057cb779146afce1cceede692af346 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Thu, 6 Aug 2015 19:15:30 -0700
Subject: Input: do not emit unneeded EV_SYN when suspending

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit 00159f19a5057cb779146afce1cceede692af346 upstream.

Do not emit EV_SYN/SYN_REPORT on suspend if there were no keys that are
still pressed as we are suspending the device (and in all other cases when
input core is forcibly releasing keys via input_dev_release_keys() call).

Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bo Hu <bohu@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 78d24990a816..5391abd28b27 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -674,13 +674,19 @@ EXPORT_SYMBOL(input_close_device);
  */
 static void input_dev_release_keys(struct input_dev *dev)
 {
+	bool need_sync = false;
 	int code;
 
 	if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
-		for_each_set_bit(code, dev->key, KEY_CNT)
+		for_each_set_bit(code, dev->key, KEY_CNT) {
 			input_pass_event(dev, EV_KEY, code, 0);
+			need_sync = true;
+		}
+
+		if (need_sync)
+			input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+
 		memset(dev->key, 0, sizeof(dev->key));
-		input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
 	}
 }
 


Patches currently in stable-queue which might be from dmitry.torokhov@gmail.com are

queue-3.18/input-do-not-emit-unneeded-ev_syn-when-suspending.patch