broonie/tinyalsa — comment on commit d9670fe91cfe78c1a71a1649f27a3d93a27822ff
File: pcm.c line 404
By tinyalsa:

pcm_start() is also slightly more complex than just _PREPARE/_START now, it contains some code related to mmapped buffers. However, since we don't support mmapped reads, I think this is OK.