The newest event can be SYN_REPORT in case of dropping all old events when
buffer is full, but as now there is no device data available to read so
lets drop SYN_REPORT as well and store only SYN_DROPPED.
Signed-off-by: Aniroop Mathur <a.mathur@xxxxxxxxxxx>
---
drivers/input/evdev.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index e9ae3d5..e270219 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -228,7 +228,7 @@ static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
return 0;
}
-static void __pass_event(struct evdev_client *client,
+static int __pass_event(struct evdev_client *client,
const struct input_event *event)
{
client->buffer[client->head++] = *event;
@@ -247,12 +247,24 @@ static void __pass_event(struct evdev_client *client,
client->buffer[client->tail].value = 0;
client->packet_head = client->tail;
+
+ /*
+ * Do not store SYN_REPORT as there is no device data in buffer
+ * and return to avoid wakeup and changing packet_head.
+ */
+ if (event->type == EV_SYN && event->code == SYN_REPORT) {
+ client->head--;
+ client->head &= client->bufsize - 1;
+ return 1;
+ }
}
if (event->type == EV_SYN && event->code == SYN_REPORT) {
client->packet_head = client->head;
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
+
+ return 0;
}
static void evdev_pass_values(struct evdev_client *client,
@@ -287,7 +299,8 @@ static void evdev_pass_values(struct evdev_client *client,
event.type = v->type;
event.code = v->code;
event.value = v->value;
- __pass_event(client, &event);
+ if (__pass_event(client, &event))
+ wakeup = false;
}
spin_unlock(&client->buffer_lock);
--
2.6.2
--
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