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Max Kellermann authored
Apparently, if snd_pcm_drain() returns EAGAIN, it does not actually want to be called again; the next call will snd_pcm_drain() will also return EAGAIN, forever, even though the PCM state has meanwhile switched to SND_PCM_STATE_SETUP. This causes a busy loop; to fix this, we should always check snd_pcm_state() to see if draining is really required.
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