Hi Jeff,
> diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
> index 7f42d3a..203ed70 100644
> --- a/drivers/input/evdev.c
> +++ b/drivers/input/evdev.c
> @@ -57,14 +57,20 @@ static void evdev_pass_event(struct evdev_client *client,
> {
> /*
> * Interrupts are disabled, just acquire the lock.
> - * Make sure we don't leave with the client buffer
> - * "empty" by having client->head == client->tail.
> + * When the client buffer is full, replace the tail with SYN_DROPPED
> + * to let the client know that events were dropped. Ensure that the
> + * head and tail never coincide so the buffer does not appear "empty".
> */
> spin_lock(&client->buffer_lock);
> - do {
> - client->buffer[client->head++] = *event;
> - client->head &= client->bufsize - 1;
> - } while (client->head == client->tail);
> + client->buffer[client->head++] = *event;
> + client->head &= client->bufsize - 1;
> + if (client->head == client->tail) {
> + client->tail = (client->tail + 1) & (client->bufsize - 1);
> + client->buffer[client->tail].time = event->time;
> + client->buffer[client->tail].type = EV_SYN;
> + client->buffer[client->tail].code = SYN_DROPPED;
> + client->buffer[client->tail].value = 0;
> + }
It looks like this will eventually fill the entire buffer with
SYN_DROPPED events if the client does not catch up.
Thanks,
Henrik
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