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media: cec/core: flush stale STATE_CHANGE events

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If the physical address becomes invalid, then flush any
old STATE_CHANGE events since those are no longer relevant.

Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2026-07-10 13:07:33 +02:00 committed by Mauro Carvalho Chehab
parent 2ff4b91e82
commit 350308a05f
1 changed files with 23 additions and 0 deletions
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23
drivers/media/cec/core/cec-adap.c
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@ -103,9 +103,32 @@ void cec_queue_event_fh(struct cec_fh *fh,
kfree(new_entry);
goto unlock;
}
new_entry->ev = *new_ev;
new_entry->ev.ts = ts;
/*
* If the physical address becomes invalid (HPD went low),
* then just flush all pending STATE_CHANGE events since
* those are all obsoleted.
*
* This ensures you will not see stale STATE_CHANGE events.
*/
if (new_ev->event == CEC_EVENT_STATE_CHANGE &&
new_ev->state_change.phys_addr == CEC_PHYS_ADDR_INVALID &&
fh->queued_events[ev_idx]) {
/* drop all events */
while (!list_empty(&fh->events[ev_idx])) {
entry = list_first_entry(&fh->events[ev_idx],
struct cec_event_entry, list);
list_del(&entry->list);
kfree(entry);
fh->total_queued_events--;
fh->queued_events[ev_idx]--;
}
new_entry->ev.flags |= CEC_EVENT_FL_DROPPED_EVENTS;
}
if (fh->queued_events[ev_idx] < max_events[ev_idx]) {
/* Add new msg at the end of the queue */
list_add_tail(&new_entry->list, &fh->events[ev_idx]);