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

[Takashi Iwai]

On Sat, 20 Feb 2016 08:18:55 +0100,
Takashi Sakamoto wrote:
> 
> 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

Applied all four patches.  Thanks.


Takashi

> 
>  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
>