[PATCH 0/2] selftests/alsa: Catch writes that silently change other controls

[HyeongJun An]

Mark asked for this in the es8316 thread [1]: have mixer-test check
for other controls changing when one is written. Patch 2 adds that.

Patch 1 fixes a bug that testing patch 2 turned up. With a driver that
notifies a neighbour with a value event, wait_for_event() returns on
the neighbour's event and the next test reports a spurious one.

The cost is two extra writes per control and a read of every other
control on the card after each. On the two cards here, 39 controls in
all, the run time does not move. I have no card with hundreds of
controls to measure against the 45 second kselftest timeout.

[1] https://lore.kernel.org/all/0fefbfe1-021b-46b2-8945-15956e75e37f@xxxxxxxxxxxxx/

HyeongJun An (2):
  selftests/alsa: Do not take another control's event as our own
  selftests/alsa: Check that a write does not silently change other
    controls

 tools/testing/selftests/alsa/mixer-test.c | 235 +++++++++++++++++++++-
 1 file changed, 234 insertions(+), 1 deletion(-)

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2.43.0