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Tzung-Bi Shih 08df0d9a00 ASoC: max98090: revert "ASoC: max98090: fix lockdep warning" Commit `2dc98af62c` ("ASoC: max98090: fix lockdep warning") introduced a helpful-less small lock: shdn_lock. Reverts the commit. Reasons: 1. Lockdep should not be happy by either the original or current code. From lockdep's point of view, there is a lock inversion anyway. Let d = dapm_mutex, c = controls_rwsem, s = shdn_lock, From the reported calling stack: lock acquisition order of snd_soc_register_card() is: d -> c. > snd_ctl_add_replace+0x3c/0x84 > dapm_create_or_share_kcontrol+0x24c/0x2e0 > snd_soc_dapm_new_widgets+0x308/0x594 > snd_soc_bind_card+0x80c/0xad4 > devm_snd_soc_register_card+0x34/0x6c If calling snd_soc_dapm_put_enum_double() in kcontrol's put (e.g. SOC_DAPM_ENUM_EXT), lock acquisition order is: c -> d. Note that, snd_soc_dapm_put_enum_double() acquires d. The possible lock inversion is always there if registering sound card and putting mixer control happen at the same time. In fact, it never happens because the control device don't show up to the userspace until the sound card build success. Commit `2dc98af62c` ("ASoC: max98090: fix lockdep warning") changes the order to: c -> s -> d. The lock inversion is still there. 2. Commit `62d5ae4caf` ("ASoC: max98090: save and restore SHDN when changing sensitive registers SHDN bit") designed to use dapm_mutex to protect SHDN bit. Use a separate lock breaks the protection. DAPM changes SHDN bit automatically when it finds the path. Thus, any code wants to change the SHDN bit, need to acquire the dapm_mutex first. > SND_SOC_DAPM_SUPPLY("SHDN", M98090_REG_DEVICE_SHUTDOWN, > M98090_SHDNN_SHIFT, 0, NULL, 0), Fixes: `2dc98af62c` ("ASoC: max98090: fix lockdep warning") Signed-off-by: Tzung-Bi Shih <tzungbi@google.com> Link: https://lore.kernel.org/r/20200117073814.82441-2-tzungbi@google.com Signed-off-by: Mark Brown <broonie@kernel.org>		2020-01-21 17:14:33 +00:00
arch	ARM fixes for 5.5-rc:	2019-12-06 16:12:39 -08:00
block
certs
crypto
Documentation	ASoC: dt-bindings: fsl_asrc: add compatible string for imx8qm & imx8qxp	2020-01-14 16:07:11 +00:00
drivers	regulator: add regulator_equal()	2020-01-14 15:52:48 +00:00
fs	9 cifs/smb3 fixes: two timestamp fixes, one oops fix (during oplock break) for stable, two fixes found in multichannel testing, two fixes for file create when using modeforsid mount parm	2019-12-08 12:12:18 -08:00
include	ASoC: soc-core: remove bus_control	2020-01-21 17:07:08 +00:00
init
ipc
kernel	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-12-08 13:28:11 -08:00
lib	lib/: fix Kconfig indentation	2019-12-07 11:00:19 -08:00
LICENSES
mm
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-12-08 13:28:11 -08:00
samples
scripts	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-12-08 13:28:11 -08:00
security
sound	ASoC: max98090: revert "ASoC: max98090: fix lockdep warning"	2020-01-21 17:14:33 +00:00
tools	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-12-08 13:28:11 -08:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap	Merge mainline/master into arm/fixes	2019-12-05 13:18:54 -08:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-12-08 13:28:11 -08:00
Makefile	Linux 5.5-rc1	2019-12-08 14:57:55 -08:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.