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1e850beea2
linux/include/sound
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Takashi Iwai 1e850beea2 ALSA: pcm: Add the support for sync-stop operation 
The standard programming model of a PCM sound driver is to process
snd_pcm_period_elapsed() from an interrupt handler.  When a running
stream is stopped, PCM core calls the trigger-STOP PCM ops, sets the
stream state to SETUP, and moves on to the next step.  This is
performed in an atomic manner -- this could be called from the interrupt
context, after all.

The problem is that, if the stream goes further and reaches to the
CLOSE state immediately, the stream might be still being processed in
snd_pcm_period_elapsed() in the interrupt context, and hits a NULL
dereference.  Such a crash happens because of the atomic operation,
and we can't wait until the stream-stop finishes.

For addressing such a problem, this commit adds a new PCM ops,
sync_stop.  This gets called at the appropriate places that need a
sync with the stream-stop, i.e. at hw_params, prepare and hw_free.

Some drivers already have a similar mechanism implemented locally, and
we'll refactor the code later.

Link: https://lore.kernel.org/r/20191117085308.23915-7-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2019-11-20 19:39:54 +01:00
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ac97 ASoC: ac97: convert to SPDX identifiers 2018-07-02 10:56:09 +01:00
sof ASoC: SOF: ipc: introduce message for DSP power gating 2019-10-28 14:43:31 +00:00
ac97_codec.h ASoC: ac97: convert to SPDX identifiers 2018-07-02 10:56:09 +01:00
aci.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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dmaengine_pcm.h ASoC: pcm_dmaengine: Extract snd_dmaengine_pcm_refine_runtime_hwparams 2019-10-01 12:18:25 +01:00
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hda_chmap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hda_codec.h ALSA: hda/hdmi - implement mst_no_extra_pcms flag 2019-10-29 17:31:30 +00:00
hda_component.h i915/snd_hdac: I915 subcomponent for the snd_hdac 2019-02-08 16:58:59 +01:00
hda_hwdep.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 32 2019-05-24 17:27:10 +02:00
hda_i915.h ALSA: hda: Make audio component support more generic 2018-07-17 22:25:48 +02:00
hda_register.h ALSA: hdac: clear link output stream mapping 2019-10-07 03:58:48 +02:00
hda_regmap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hda_verbs.h ALSA: hda: add verbs for stripe control 2019-01-14 19:52:23 +01:00
hdaudio_ext.h ALSA: hda: Direct MMIO accesses 2019-08-08 16:36:18 +02:00
hdaudio.h ALSA: hda: Unexport a few more stuff 2019-08-14 20:00:56 +02:00
hdmi-codec.h ASoC: hdmi-codec: Add an op to set callback function for plug event 2019-09-09 14:50:03 +01:00
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intel-dsp-config.h ALSA: hda: add Intel DSP configuration / probe code 2019-10-23 06:31:37 +02:00
intel-nhlt.h ALSA: hda: intel-nhlt: handle NHLT VENDOR_DEFINED DMIC geometry 2019-07-31 15:46:00 +02:00
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l3.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
madera-pdata.h ASoC: madera: Update SPDX headers 2019-06-26 12:27:50 +01:00
max9768.h
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memalloc.h ALSA: memalloc: Drop snd_dma_pci_data() macro 2019-11-11 09:14:07 +01:00
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pcm_drm_eld.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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pcm.h ALSA: pcm: Add the support for sync-stop operation 2019-11-20 19:39:54 +01:00
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simple_card_utils.h Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-5.5 2019-11-06 16:29:34 +00:00
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soc-acpi-intel-match.h ASoC: Intel: common: add ACPI matching tables for JSL 2019-10-23 17:46:12 +01:00
soc-acpi.h ASoC: Intel: skl-hda-dsp-generic: use snd-hda-codec-hdmi 2019-10-29 17:31:54 +00:00
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