AM824_MAX_CHANNELS_FOR_MIDI
struct snd_rawmidi_substream *midi[AM824_MAX_CHANNELS_FOR_MIDI * 8];
int midi_fifo_used[AM824_MAX_CHANNELS_FOR_MIDI * 8];
if (midi_channels > AM824_MAX_CHANNELS_FOR_MIDI)
WARN_ON(midi_channels > AM824_MAX_CHANNELS_FOR_MIDI))
formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)