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Gabor Juhos b991eda2a7 regulator: core: disable supply if enabling main regulator fails 
[ Upstream commit fb1ebb1046 ]

For 'always-on' and 'boot-on' regulators, the set_machine_constraints()
may enable supply before enabling the main regulator, however if the
latter fails, the function returns with an error but the supply remains
enabled.

When this happens, the regulator_register() function continues on the
error path where it puts the supply regulator. Since enabling the supply
is not balanced with a disable call, a warning similar to the following
gets issued from _regulator_put():

    [    1.603889] WARNING: CPU: 2 PID: 44 at _regulator_put+0x8c/0xa0
    [    1.603908] Modules linked in:
    [    1.603926] CPU: 2 UID: 0 PID: 44 Comm: kworker/u16:3 Not tainted 6.18.0-rc4 #0 NONE
    [    1.603938] Hardware name: Qualcomm Technologies, Inc. IPQ9574/AP-AL02-C7 (DT)
    [    1.603945] Workqueue: async async_run_entry_fn
    [    1.603958] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [    1.603967] pc : _regulator_put+0x8c/0xa0
    [    1.603976] lr : _regulator_put+0x7c/0xa0
    ...
    [    1.604140] Call trace:
    [    1.604145]  _regulator_put+0x8c/0xa0 (P)
    [    1.604156]  regulator_register+0x2ec/0xbf0
    [    1.604166]  devm_regulator_register+0x60/0xb0
    [    1.604178]  rpm_reg_probe+0x120/0x208
    [    1.604187]  platform_probe+0x64/0xa8
    ...

In order to avoid this, change the set_machine_constraints() function to
disable the supply if enabling the main regulator fails.

Fixes: 05f224ca66 ("regulator: core: Clean enabling always-on regulators + their supplies")
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Link: https://patch.msgid.link/20251107-regulator-disable-supply-v1-1-c95f0536f1b5@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-18 13:54:55 +01:00
arch perf/x86/intel: Correct large PEBS flag check 2025-12-18 13:54:55 +01:00
block block/mq-deadline: Switch back to a single dispatch list 2025-12-18 13:54:45 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id 2025-12-18 13:54:47 +01:00
Documentation dt-bindings: clock: qcom,x1e80100-gcc: Add missing USB4 clocks/resets 2025-12-18 13:54:44 +01:00
drivers regulator: core: disable supply if enabling main regulator fails 2025-12-18 13:54:55 +01:00
fs ext4: correct the checking of quota files before moving extents 2025-12-18 13:54:54 +01:00
include perf: Remove get_perf_callchain() init_nr argument 2025-12-18 13:54:49 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/napi: fix io_napi_entry RCU accesses 2025-11-24 10:36:06 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel locktorture: Fix memory leak in param_set_cpumask() 2025-12-18 13:54:54 +01:00
lib maple_tree: fix tracepoint string pointers 2025-12-01 11:43:39 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/huge_memory: fix NULL pointer deference when splitting folio 2025-12-07 06:25:02 +09:00
net sctp: Defer SCTP_DBG_OBJCNT_DEC() to sctp_destroy_sock(). 2025-12-18 13:54:48 +01:00
rust rust: kbuild: workaround rustdoc doctests modifier bug 2025-11-24 10:36:07 +01:00
samples samples: work around glibc redefining some of our defines wrong 2025-12-12 18:37:21 +01:00
scripts kconfig/nconf: Initialize the default locale at startup 2025-12-01 11:43:36 +01:00
security smack: fix bug: setting task label silently ignores input garbage 2025-12-18 13:54:40 +01:00
sound ALSA: usb-audio: Add native DSD quirks for PureAudio DAC series 2025-12-12 18:37:20 +01:00
tools libbpf: Fix parsing of multi-split BTF 2025-12-18 13:54:53 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-24 10:36:06 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.62 2025-12-12 18:37:22 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.