A SYN event is reported in input_release_keys even if no keys are
released. Stop doing this as the superfluous event can prevent autosleep
if a user has opened a device with EPOLLWAKEUP enabled.
Based on a patch developed by Ting Li <ting.li@xxxxxxxxx>.
Signed-off-by: Hans Holmberg <hans.holmberg@xxxxxxxxx>
---
drivers/input/input.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 78d2499..c748805 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -675,12 +675,18 @@ EXPORT_SYMBOL(input_close_device);
static void input_dev_release_keys(struct input_dev *dev)
{
int code;
+ bool key_released = false;
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);
- memset(dev->key, 0, sizeof(dev->key));
- input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+ key_released = true;
+ }
+
+ if (key_released) {
+ memset(dev->key, 0, sizeof(dev->key));
+ input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+ }
}
}
--
1.9.1
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