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062f19b214
handle_acp_poll() copies the poll revents into ACP and clears them, but
never actually looks at them. When one of the polled fds reports
POLLERR/POLLHUP - which happens when the ALSA card goes away, e.g. the
audio function of a USB dock being unplugged - the source is never
removed, and because that condition is level-triggered the loop just
keeps redispatching the handler.
The result is wireplumber pegged at 100% CPU, spinning on the card's
control fd:
read(24, ..., 72) = -1 ENODEV (No such device)
with fd 24 pointing at a now-deleted /dev/snd/controlC<n>. It stays like
that until the card comes back or the service is restarted.
Accumulate the returned mask and, if anything reports SPA_IO_ERR or
SPA_IO_HUP, drop the poll sources so we stop hammering a dead descriptor.
The udev monitor still drives the real device removal and setup_sources()
re-arms the poll if the card reappears - the same teardown alsa-pcm.c
already does for its own control sources.
Signed-off-by: Mike Lothian <mike@fireburn.co.uk>
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