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b450b87847
linux_dsm_epyc7002/include/sound
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Pierre-Louis Bossart b450b87847
ASoC: core: don't increase component module refcount unconditionally 
The ASoC core has for the longest time increased the module reference
counts, even before the transition to the component model. This is
probably fine on most platforms, but it introduces a deadlock case on
Intel devices with the Skylake and SOF drivers which cannot be removed
due to their reference counts being modified by the core.

In these 2 cases, the PCI or ACPI driver .probe creates a platform
device to let the machine driver .probe register the audio
card. Conversely the PCI or ACPI driver .remove will unregister the
platform device which results in the card being removed by the machine
driver .remove.

With ascii art, this can be represented as

modprobe
snd_soc_skl/
soc-pci-dev/sof-acpci-dev  ----------> pci/acpi probe
       ^                                    |
       |                     ---------------|
       |                    |               |
       |                    V               V
    increase            register        register machine
    refcount            component       platform_device
       ^                                    |
       |                                    |
       |                                    V
    component <----   register card  <---- probe
    probe

The issue is that by playing with the component's module reference
counts during the card registration, it's no longer possible to remove
the module which controls the component. This can be shown, e.g. with
the following error:

root@plb-XPS-13-9350:~# lsmod | grep snd_soc_skl
snd_soc_skl           110592  1

root@plb-XPS-13-9350:~# rmmod snd_soc_skl
rmmod: ERROR: Module snd_soc_skl is in use

Increasing the reference count during the component probe is not
useful. If the PCI/ACPI module is removed, the card will be removed
anyway.

To avoid breaking existing platforms and allowing Intel platforms to
safely deal with module load/unload cases, this patch introduces a
flag which needs to be set during the component initialization. This
is a strictly opt-in capability that should only be used when the
handling of the component module does not require a reference count
increase to prevent removal during use.

Note that this solution is not directly applicable to the legacy
Atom/SST driver, which uses a different device hierarchy. There are
however additional refcount issues which prevent the ACPI driver from
being removed. This is a different issue which would need a different
patch.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-02-08 18:00:20 +00:00
..
ac97 ASoC: ac97: convert to SPDX identifiers 2018-07-02 10:56:09 +01:00
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
ad1816a.h ALSA: ad1816a: Remove always NULL parameters 2015-01-02 16:26:20 +01:00
ad1843.h
adau1373.h
aess.h ASoC: TI AESS: add autogating-enable function, callable from architecture code 2013-02-10 11:22:23 -07:00
ak4xxx-adda.h
ak4113.h ALSA: ak411x: Use array instead of offsetof() 2017-05-17 07:13:03 +02:00
ak4114.h ALSA: ak411x: Use array instead of offsetof() 2017-05-17 07:13:03 +02:00
ak4117.h ALSA: ak411x: Use array instead of offsetof() 2017-05-17 07:13:03 +02:00
ak4531_codec.h
ak4641.h
alc5623.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
asequencer.h
asound.h
asoundef.h
compress_driver.h ALSA: soc-compress: add support to snd_compr_set_runtime_buffer() 2018-12-14 12:43:41 +00:00
control.h ALSA: control: Hardening for potential Spectre v1 2018-04-25 10:37:46 +02:00
core.h ALSA: core: Assure control device to be registered at last 2018-05-17 08:21:23 +02:00
cs35l33.h ASoC: cs35l33: Initial commit of the cs35l33 CODEC driver. 2016-06-27 17:39:06 +01:00
cs35l34.h ASoC: cs35l34: Initial commit of the cs35l34 CODEC driver. 2016-10-21 12:02:44 +01:00
cs35l35.h ASoC: cs35l35: Add Boost Inductor Calculation 2017-05-19 17:31:34 +01:00
cs35l36.h ASoC: cs35l36: Add support for Cirrus CS35L36 Amplifier 2019-02-08 13:00:28 +00:00
cs42l52.h ASoC: cs42l52: Make MICA/B mixer dependent on mic config 2013-11-28 10:20:51 +00:00
cs42l56.h ASoC: Add support for CS42L56 CODEC 2014-05-05 18:20:22 -07:00
cs42l73.h ASoC: cs42l73: Add platform data support for cs42l73 codec 2013-10-18 00:37:29 +01:00
cs4231-regs.h
cs4271.h
cs8403.h
cs8427.h ALSA: cs8427: separate HW initialization 2014-04-03 14:59:48 +02:00
da7213.h ASoC: da7213: Add support to handle mclk data provided to driver 2015-10-07 15:11:34 +01:00
da7218.h ASoC: da7218: Add da7218 codec driver 2015-11-30 12:24:12 +00:00
da7219-aad.h ASoC: codecs: Add da7219 codec driver 2015-10-02 18:11:27 +01:00
da7219.h ASoC: da7219: Add common clock usage for providing DAI clks 2018-03-09 17:40:41 +00:00
da9055.h
designware_i2s.h ASoC: dwc: Added a quirk DW_I2S_QUIRK_16BIT_IDX_OVERRIDE to dwc driver 2017-06-28 19:01:12 +01:00
dmaengine_pcm.h ASoC: soc-generic-dmaengine-pcm: convert to SPDX identifiers 2018-07-02 10:55:52 +01:00
emu10k1_synth.h
emu10k1.h ALSA: emu10k1: Reduce GFP_ATOMIC allocation 2018-04-16 14:01:53 +02:00
emu8000_reg.h
emu8000.h
emux_legacy.h
emux_synth.h ALSA: seq: Allow the tristate build of OSS emulation 2017-06-09 22:09:45 +02:00
es1688.h ALSA: es1688: Remove almost always NULL parameter 2015-01-02 16:27:03 +01:00
gus.h ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
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: Refactor display power management 2018-12-11 08:06:55 +01:00
hda_component.h ALSA: hda: Make snd_hdac_display_power() void function 2018-12-11 08:18:25 +01:00
hda_hwdep.h
hda_i915.h ALSA: hda: Make audio component support more generic 2018-07-17 22:25:48 +02:00
hda_register.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hdaudio_ext.h ALSA: hdac: add extended ops in the hdac_bus 2018-06-28 07:33:29 +02:00
hdaudio.h ALSA: HD-Audio: SKL+: force HDaudio legacy or SKL+ driver selection 2018-12-19 18:07:23 +01:00
hdmi-codec.h ASoC: hdmi-codec: add .get_dai_id support 2017-05-24 18:45:29 +01:00
hwdep.h ->poll() methods should return __poll_t 2017-11-27 16:19:52 -05:00
i2c.h ALSA: i2c: constify snd_i2c_ops structures 2015-11-30 11:40:08 +01:00
info.h ->poll() methods should return __poll_t 2017-11-27 16:19:52 -05:00
initval.h
jack.h ALSA: jack: Allow building the jack layer without input device 2016-02-23 09:03:07 +01:00
l3.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
max9768.h
max98088.h
max98090.h ASoC:: max98090: Remove executable bit 2013-03-20 10:54:12 +01:00
max98095.h
memalloc.h ALSA: memalloc: Add non-cached buffer type 2018-08-28 13:56:47 +02:00
minors.h
mixer_oss.h ALSA: Use IS_ENABLED() in common headers 2017-05-17 07:13:04 +02:00
mpu401.h
omap-hdmi-audio.h drm: omapdrm: hdmi: Pass HDMI core version as integer to HDMI audio 2017-08-16 12:52:41 +03:00
opl3.h ALSA: seq: Allow the tristate build of OSS emulation 2017-06-09 22:09:45 +02:00
opl4.h
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
pcm_iec958.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pcm_oss.h ALSA: pcm: Return -EBUSY for OSS ioctls changing busy streams 2018-03-23 22:18:05 +01:00
pcm_params.h ALSA: pcm: Fix interval evaluation with openmin/max 2018-11-29 12:05:19 +01:00
pcm-indirect.h ALSA: pcm: Fix negative appl_ptr handling in pcm-indirect helpers 2017-05-25 23:34:45 +02:00
pcm.h ALSA: pcm: Add __force to cast in snd_pcm_lib_read/write() 2018-07-26 08:32:13 +02:00
pt2258.h
pxa2xx-lib.h ASoC: pxa: move some functions to pxa2xx-lib 2018-06-29 12:05:04 +01:00
rawmidi.h ALSA: rawmidi: A lightweight function to discard pending bytes 2018-10-04 20:13:17 +02:00
rt286.h ASoC: add RT286 CODEC driver 2014-07-04 18:50:51 +01:00
rt298.h ASoC: add rt298 codec driver 2015-07-09 12:00:11 +01:00
rt5514.h ASoC: rt5514: The DSP clock can be calibrated by the other clock source 2017-11-07 11:23:36 +01:00
rt5645.h ASoC: rt5645: Set card long_name for GPD win / pocket 2017-12-12 10:41:56 +00:00
rt5659.h ASoC: rt5659: Add the support of Intel HDA Header 2018-02-12 09:31:26 +00:00
rt5660.h ASoC: rt5660: add rt5660 codec driver 2016-09-24 19:51:57 +01:00
rt5663.h ASoC: rt5663: Add the function of impedance sensing 2017-09-19 12:57:59 +01:00
rt5665.h treewide: Remove remaining executable attributes from source files 2017-02-25 12:12:50 -08:00
rt5668.h ASoC: rt5668: add rt5668B codec driver 2018-04-16 19:24:32 +01:00
rt5670.h ASoC: rt5670: Add IRQ function 2015-03-11 12:08:20 +00:00
rt5682.h ASoC: rt5682: add rt5682 codec driver 2018-06-18 12:54:38 +01:00
s3c24xx_uda134x.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sb16_csp.h ALSA: sb: Fix sparse warning wrt PCM format type 2018-07-27 09:05:33 +02:00
sb.h ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
seq_device.h ALSA: seq: Define driver object in each driver 2015-02-12 14:15:54 +01:00
seq_kernel.h ALSA: seq: Avoid invalid lockdep class warning 2017-11-06 20:25:31 +01:00
seq_midi_emul.h
seq_midi_event.h ALSA: seq: Minor cleanup of MIDI event parser helpers 2018-08-01 22:54:35 +02:00
seq_oss_legacy.h
seq_oss.h
seq_virmidi.h ALSA: seq: virmidi: Use READ_ONCE/WRITE_ONCE() macros 2018-07-30 14:52:30 +02:00
sh_dac_audio.h
sh_fsi.h ASoC: fsi: convert to SPDX identifiers 2018-08-02 10:56:59 +01:00
simple_card_utils.h ASoC: simple-card: rename to asoc_simple_card_canonicalize_platform() 2019-01-21 18:14:16 +00:00
simple_card.h ASoC: simple-card: convert to SPDX identifiers 2018-07-02 10:52:47 +01:00
snd_wavefront.h ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
soc-acpi-intel-match.h ASoC: Intel: common: add ACPI matching tables for ICL 2018-12-03 12:02:13 +00:00
soc-acpi.h ASoC: soc-acpi: add static inline fallbacks when CONFIG_ACPI=n 2019-01-28 12:34:30 +00:00
soc-dai.h ASoC: core: add support to snd_soc_dai_get_channel_map() 2018-07-24 12:06:43 +01:00
soc-dapm.h ASoC: dapm: harden use of lookup tables 2019-02-06 17:32:02 +00:00
soc-dpcm.h ASoC: add for_each_dpcm_be() macro 2018-09-20 10:31:20 -07:00
soc-topology.h ASoC: topology: unload physical dai link in remove 2019-02-04 11:59:30 +01:00
soc.h ASoC: core: don't increase component module refcount unconditionally 2019-02-08 18:00:20 +00:00
soundfont.h
spear_dma.h ASoC: Update email-id of Rajeev Kumar 2015-04-28 16:31:01 +01:00
spear_spdif.h
sta32x.h ASoC: sta32x: add device tree binding. 2015-01-27 17:13:25 +00:00
sta350.h ASoC: sta350: add support for bits in miscellaneous registers 2014-05-05 12:52:59 -07:00
tas2552-plat.h ASoC: tas2552: Support TI TAS2552 Amplifier 2014-07-17 17:57:05 +01:00
tas5086.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tea6330t.h
timer.h ALSA: timer: Limit max instances per timer 2017-11-06 10:41:24 +01:00
tlv320aic3x.h ASoC: tlv320aic3x: Convert mic bias to a supply widget 2013-02-04 18:35:19 +00:00
tlv320aic32x4.h ASoC: tlv320aic32x4: Add gpio configuration to the codec 2017-07-17 16:22:28 +01:00
tlv320dac33-plat.h
tlv.h ALSA: control: cage TLV_DB_RANGE_HEAD in kernel land because it was obsoleted 2016-09-25 22:16:49 +02:00
tpa6130a2-plat.h
uda134x.h ASoC: uda134x: Remove is_powered_on_standby from platform data 2014-11-24 18:04:49 +00:00
uda1380.h
util_mem.h
vx_core.h ALSA: vx: Use nonatomic PCM ops 2014-09-15 15:52:03 +02:00
wavefront.h
wm0010.h
wm1250-ev1.h
wm2000.h
wm2200.h ASoC: wm2200: Provide platform data for MICBIAS configuration 2013-02-05 15:53:07 +00:00
wm5100.h
wm8903.h
wm8904.h ASoC: wm8904: Correct number of EQ registers 2015-10-20 15:46:09 +01:00
wm8955.h
wm8960.h
wm8962.h ASoC: wm8962: Let CODEC driver enable and disable its own MCLK 2014-07-31 20:51:26 +01:00
wm8993.h
wm8996.h
wm9081.h
wm9090.h
wss.h ALSA: wss: Remove (almost) always NULL parameters 2015-01-02 16:30:08 +01:00