media: cec-pin: Fix event FIFO ordering

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cec_pin_update() fills work_pin_events[] and work_pin_ts[], then
increments work_pin_num_events. cec_pin_thread_func() uses that counter
to decide when to read the FIFO entries.

Do not let the counter update be observed without the event update. Also
do not let a freed slot be reused before the thread has finished reading
it. Use release operations when publishing an entry and releasing a slot,
and acquire operations when consuming those counter updates.

Leave the other work_pin_num_events users as they do not participate in
this FIFO publication path.

Fixes: ea5c8ef296 ("media: cec-pin: add low-level pin hardware support")
Signed-off-by: Gui-Dong Han <hanguidong02@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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Gui-Dong Han 2026-06-26 16:08:06 +08:00 • committed by Hans Verkuil

parent 3bc2e4a264

commit a1d83d1b81

1 changed files with 4 additions and 4 deletions

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drivers/media/cec/core/cec-pin.c

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