[alsa-devel] [PATCH 0/4] ALSA: bebob: give up updating streams at bus reset

[Takashi Sakamoto]

Hi,

This patchset is to simplify codes of ALSA bebob driver by giving up
updating streams at bus reset. 

DM1000/DM1100/DM1500 chipsets have a quirk to transfer packets with
discontinuous value in 'dbc' field of CIP header. This is against packet
streaming protocol (IEC 61883-1/6).

In the specification, units should continue packet streaming during 1 seconds
after bus reset. During this period, connections are updated. Else, the
streaming stops.

The discontinuity causes firewire-lib module (packet streaming layer) to stop
streaming immediately. This is done far earlier than executing bus-reset
handler. Therefore, updating streams at the bus-reset handler has no meaning.

This patchset will have little impacts for userspace applications because
most users won't update IEEE 1394 bus when playbacking/recording. And PCM
substream recovery is still available.

Regards


Takashi Sakamoto (4):
  ALSA: bebob: simplify bus-reset handling
  ALSA: bebob: move mutex from function callee to callers
  ALSA: bebob: change type of substream counter from atomic_t to
    unsigned int
  ALSA: bebob: give up updating streams at bus reset handler

 sound/firewire/bebob/bebob.c        | 21 ++++++++++----
 sound/firewire/bebob/bebob.h        |  5 +---
 sound/firewire/bebob/bebob_midi.c   | 16 +++++++---
 sound/firewire/bebob/bebob_pcm.c    | 28 +++++++++++++-----
 sound/firewire/bebob/bebob_stream.c | 58 +++----------------------------------
 5 files changed, 53 insertions(+), 75 deletions(-)

-- 
2.5.0