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
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