[alsa-devel] [PATCH 2/2] ALSA: firewire-lib: fix to process MIDI conformant data channel for AM824 format

[Takashi Iwai]

On Fri, 28 Jun 2019 07:53:31 +0200,
Takashi Sakamoto wrote:
> 
> In IEC 61883-6, 8 MIDI data streams are multiplexed into single MIDI
> conformant data channel. The index of stream is calculated by modulo 8
> of the value of data block counter. Therefore data block processing
> layer requires valid value of data block counter.
> 
> In recent changes of ALSA IEC 61883-1/6 engine, the value of data block
> counter is changed before calling data block processing layer. This
> brings miss detection of MIDI messages in non-blocking transmission
> method is used.
> 
> This commit fixes the bug by changing chached data block counter after
> calling data block processing layer.
> 
> Fixes: e335425b6596 ("ALSA: firewire-lib: split helper function to check incoming CIP header")
> Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>

Thanks, applied now.


Takashi