[PATCH 0/4] ALSA: pcm: obsolete sync member in runtime structure

[Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>]

Hi,

Seven years ago, in Linux kernel version 4.13, the data of
snd_pcm_sync_id union is not exposed to user space anymore, by a commit
e11f0f90a626 ("ALSA: pcm: remove SNDRV_PCM_IOCTL1_INFO internal command").
>From then, we have received no issued related to it. It means that the
data is neither used by any practical applications nor drivers, thus it
can be removed.

This series of change is to obsolete the usage of the union data
in PCM core function. The kernel API, snd_pcm_set_sync(), is removed.
and the 'sync' member of snd_pcm_runtime structure is removed. Finally,
some notes are added to UAPI header.

The removal of sync field has a side effect for emu10k driver, since p16v
chip code sets the data by hand. Its removal requires any deliberate
discussion, but the calm in seven years would satisfy the condition of
it.


The patch comment sent by Jaroslav[1] refers to the reinvention of the
union data, but as the part of hardware configuration step. If it
proceeds, the UAPI note would be modified simply.

[1] https://lore.kernel.org/linux-sound/20240430161012.4011064-1-perex@xxxxxxxx/

Takashi Sakamoto (4):
  ALSA: pcm: delete snd_pcm_set_sync() in .open callback
  ALSA: pci: emu10k: delete usage of 'struct snd_pcm_runtime.sync'
  ALSA: core: delete sync member from snd_pcm_runtime structure
  ALSA: pcm: add notes to deprecate snd_pcm_sync_id in PCM interface for
    user space

 include/sound/pcm.h                      |  3 ---
 include/uapi/sound/asound.h              |  5 +++--
 sound/core/pcm_lib.c                     | 17 -----------------
 sound/firewire/bebob/bebob_pcm.c         |  1 -
 sound/firewire/dice/dice-pcm.c           |  1 -
 sound/firewire/digi00x/digi00x-pcm.c     |  1 -
 sound/firewire/fireface/ff-pcm.c         |  1 -
 sound/firewire/fireworks/fireworks_pcm.c |  1 -
 sound/firewire/motu/motu-pcm.c           |  1 -
 sound/firewire/oxfw/oxfw-pcm.c           |  1 -
 sound/firewire/tascam/tascam-pcm.c       |  1 -
 sound/isa/wss/wss_lib.c                  |  2 --
 sound/pci/ali5451/ali5451.c              |  1 -
 sound/pci/asihpi/asihpi.c                |  2 --
 sound/pci/ca0106/ca0106_main.c           |  1 -
 sound/pci/echoaudio/echoaudio.c          |  1 -
 sound/pci/emu10k1/p16v.c                 | 11 +----------
 sound/pci/ens1370.c                      |  3 ---
 sound/pci/hda/hda_controller.c           |  1 -
 sound/pci/ice1712/ice1712.c              |  2 --
 sound/pci/ice1712/ice1724.c              |  5 -----
 sound/pci/lx6464es/lx6464es.c            |  1 -
 sound/pci/oxygen/oxygen_pcm.c            |  1 -
 sound/pci/pcxhr/pcxhr.c                  |  1 -
 sound/pci/rme32.c                        |  4 ----
 sound/pci/rme96.c                        |  4 ----
 sound/pci/rme9652/hdsp.c                 |  2 --
 sound/pci/rme9652/hdspm.c                |  1 -
 sound/pci/rme9652/rme9652.c              |  2 --
 sound/pci/sis7019.c                      |  2 --
 sound/pci/trident/trident_main.c         |  2 --
 sound/soc/intel/avs/pcm.c                |  1 -
 sound/soc/intel/skylake/skl-pcm.c        |  1 -
 sound/sparc/cs4231.c                     |  2 --
 34 files changed, 4 insertions(+), 82 deletions(-)

-- 
2.43.0