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Danilo Krummrich 121f787e74 iommu/arm-smmu-qcom: do not register driver in probe() 
commit ed1ac3c977 upstream.

Commit 0b4eeee287 ("iommu/arm-smmu-qcom: Register the TBU driver in
qcom_smmu_impl_init") intended to also probe the TBU driver when
CONFIG_ARM_SMMU_QCOM_DEBUG is disabled, but also moved the corresponding
platform_driver_register() call into qcom_smmu_impl_init() which is
called from arm_smmu_device_probe().

However, it neither makes sense to register drivers from probe()
callbacks of other drivers, nor does the driver core allow registering
drivers with a device lock already being held.

The latter was revealed by commit dc23806a7c ("driver core: enforce
device_lock for driver_match_device()") leading to a deadlock condition
described in [1].

Additionally, it was noted by Robin that the current approach is
potentially racy with async probe [2].

Hence, fix this by registering the qcom_smmu_tbu_driver from
module_init(). Unfortunately, due to the vendoring of the driver, this
requires an indirection through arm-smmu-impl.c.

Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/lkml/7ae38e31-ef31-43ad-9106-7c76ea0e8596@sirena.org.uk/
Link: https://lore.kernel.org/lkml/DFU7CEPUSG9A.1KKGVW4HIPMSH@kernel.org/ [1]
Link: https://lore.kernel.org/lkml/0c0d3707-9ea5-44f9-88a1-a65c62e3df8d@arm.com/ [2]
Fixes: dc23806a7c ("driver core: enforce device_lock for driver_match_device()")
Fixes: 0b4eeee287 ("iommu/arm-smmu-qcom: Register the TBU driver in qcom_smmu_impl_init")
Acked-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Acked-by: Konrad Dybcio <konradybcio@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> #LX2160ARDB
Tested-by: Wang Jiayue <akaieurus@gmail.com>
Reviewed-by: Wang Jiayue <akaieurus@gmail.com>
Tested-by: Mark Brown <broonie@kernel.org>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Link: https://patch.msgid.link/20260121141215.29658-1-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-02-19 16:29:56 +01:00
arch LoongArch: Rework KASAN initialization for PTW-enabled systems 2026-02-19 16:29:55 +01:00
block block,bfq: fix aux stat accumulation destination 2026-02-11 13:40:19 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:28:39 +01:00
Documentation gpiolib-acpi: Update file references in the Documentation and MAINTAINERS 2026-02-11 13:40:29 +01:00
drivers iommu/arm-smmu-qcom: do not register driver in probe() 2026-02-19 16:29:56 +01:00
fs f2fs: fix to avoid mapping wrong physical block for swapfile 2026-02-19 16:29:56 +01:00
include mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather 2026-02-19 16:29:55 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/rw: recycle buffers manually for non-mshot reads 2026-02-12 13:14:56 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel cpuset: Fix missing adaptation for cpuset_is_populated 2026-02-19 16:29:55 +01:00
lib procfs: avoid fetching build ID while holding VMA lock 2026-02-11 13:40:18 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu_gather 2026-02-19 16:29:55 +01:00
net mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() 2026-02-16 10:18:45 +01:00
rust rust: rbtree: fix documentation typo in CursorMut peek_next method 2026-02-06 16:55:44 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:14:50 +01:00
scripts scripts: generate_rust_analyzer: Add compiler_builtins -> core dep 2026-02-06 16:55:47 +01:00
security keys/trusted_keys: fix handle passed to tpm_buf_append_name during unseal 2026-01-30 10:28:44 +01:00
sound ASoC: fsl_xcvr: fix missing lock in fsl_xcvr_mode_put() 2026-02-19 16:29:54 +01:00
tools vsock/test: verify socket options after setting them 2026-02-12 13:14:57 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:40:17 +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 gpiolib-acpi: Update file references in the Documentation and MAINTAINERS 2026-02-11 13:40:29 +01:00
Makefile Linux 6.12.73 2026-02-16 17:09:13 +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.