user/sven/linux.git/drivers/mux, branch next/master

Merge branch 'char-misc-next' of https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git

2026-04-16T13:09:11Z

mux: mmio: Zero the allocated memory

2026-03-17T15:38:25Z

Zero the allocated memory in probe() for fields and hardware states because: 1. The "hardware_states" array is not initialized in the probe, thus starting the device with uninitialized memory. This not a bug, because pointed memory will be assigned in suspend callback, however it is a discouraged coding practice. The "fields" array is initialized shortly further in the probe(). 2. Linux kernel convention for safer code encourages using zeroed allocations, as expressed in memory-allocation.rst document. Cc: Greg Kroah-Hartman Signed-off-by: Krzysztof Kozlowski Link: https://patch.msgid.link/20260317152029.274829-2-krzysztof.kozlowski@oss.qualcomm.com Signed-off-by: Greg Kroah-Hartman

mux: add visible config symbol to enable multiplexer subsystem

2026-03-09T12:44:45Z

The multiplexer subsystem was initially designed to be completely hidden, relying on consumers to "select MULTIPLEXER" explicitly. Drivers implementing multiplexers depend on this hidden symbol. This prevents users from manually enabling both the mux core and any of the multiplexer drivers. All multiplexer drivers in drivers/mux/ can operate standalone without a consumer. This is particularly useful in a device-tree, where a default state can be set through the idle-state property. Over time, several drivers have added "select MULTIPLEXER" dependencies, some of which require a mux and some consider it optional. v7.0-rc1 shows 15 such occurrences in Kconfig files, in a variety of subsystems. The natural step forward to allow enabling mux core and drivers would be adding a prompt and help text to the existing symbol. This violates the general Kbuild advice to avoid selecting visible symbols for all existing consumers of the mux core. Add the new config symbol MUX_CORE with a prompt and help text as a wrapper for users to enable manually. This avoids existing consumers automatically selecting a visible symbol. Change the MULTIPLEXER symbol from tristate to bool. This avoids complex dependencies if users were to attempt a configuration where the mux is a module but one of its consumers is built-in, as well as difficulties keeping the state of visible and invisible symbols in sync. Further convert the "menu ... depends on ..." structure to "if ... menu ... endmenu endif". These are functionally equivalent, but the new structure is more efficient and can support future source statements within the conditional block. Signed-off-by: Josua Mayer Signed-off-by: Ulf Hansson

mux: Add helper functions for getting optional and selected mux-state

2026-03-09T12:44:45Z

In-tree phy-can-transceiver and phy_rcar_gen3_usb2 have already implemented local versions of devm_mux_state_get_optional. The omap-i2c driver gets and selects an optional mux in its probe function without using any helper. Add new helper functions covering both aforementioned use-cases: - mux_control_get_optional: Get a mux-control if specified in dt, return NULL otherwise. - devm_mux_state_get_optional: Get a mux-state if specified in dt, return NULL otherwise. - devm_mux_state_get_selected: Get and select a mux-state specified in dt, return error otherwise. - devm_mux_state_get_optional_selected: Get and select a mux-state if specified in dt, return error or NULL. Existing mux_get helper function is changed to take an extra argument indicating whether the mux is optional. In this case no error is printed, and NULL returned in case of ENOENT. Calling code is adapted to handle NULL return case, and to pass optional argument as required. To support automatic deselect for _selected helper, a new structure is created storing an exit pointer similar to clock core which is called on release. To facilitate code sharing between optional/mandatory/selected helpers, a new internal helper function is added to handle quiet (optional) and verbose (mandatory) errors, as well as storing the correct callback for devm release: __devm_mux_state_get Due to this structure devm_mux_state_get_*_selected can no longer print a useful error message when select fails. Instead callers should print errors where needed. Commit e153fdea9db04 ("phy: can-transceiver: Re-instate "mux-states" property presence check") noted that "mux_get() always prints an error message in case of an error, including when the property is not present, confusing the user." The first error message covers the case that a mux name is not matched in dt. The second error message is based on of_parse_phandle_with_args return value. In optional case no error is printed and NULL is returned. This ensures that the new helper functions will not confuse the user either. With the addition of optional helper functions it became clear that drivers should compile and link even if CONFIG_MULTIPLEXER was not enabled. Add stubs for all symbols exported by mux core. Acked-by: Wolfram Sang Signed-off-by: Josua Mayer Signed-off-by: Ulf Hansson

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51Z

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

mux: mmio: fix regmap leak on probe failure

2026-02-05T16:07:37Z

The mmio regmap that may be allocated during probe is never freed. Switch to using the device managed allocator so that the regmap is released on probe failures (e.g. probe deferral) and on driver unbind. Fixes: 61de83fd8256 ("mux: mmio: Do not use syscon helper to build regmap") Cc: stable@vger.kernel.org # 6.16 Cc: Andrew Davis Signed-off-by: Johan Hovold Acked-by: Andrew Davis Link: https://patch.msgid.link/20251127134702.1915-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman

mux: mmio: Fix IS_ERR() vs NULL check in probe()

2026-01-16T15:42:08Z

The devm_kmalloc() function never returns error pointers, it returns NULL on error. Fix the error checking. Fixes: 4863cb2b0f50 ("mux: mmio: Add suspend and resume support") Signed-off-by: Dan Carpenter Reviewed-by: Krzysztof Kozlowski Link: https://patch.msgid.link/aSsIP7oKrhKfCUv3@stanley.mountain Signed-off-by: Greg Kroah-Hartman

mux: mmio: Add suspend and resume support

2025-11-26T14:09:30Z

The status of each mux is read during suspend and stored in the private memory of the mux_chip. Then the state is restored during the resume. Reviewed-by: Andrew Davis Signed-off-by: Thomas Richard (TI.com) Link: https://patch.msgid.link/20251013-mux-mmio-resume-support-v5-1-de9467ceb2b2@bootlin.com Signed-off-by: Greg Kroah-Hartman

Merge tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2025-07-29T00:16:12Z

Pull hardening updates from Kees Cook: - Introduce and start using TRAILING_OVERLAP() helper for fixing embedded flex array instances (Gustavo A. R. Silva) - mux: Convert mux_control_ops to a flex array member in mux_chip (Thorsten Blum) - string: Group str_has_prefix() and strstarts() (Andy Shevchenko) - Remove KCOV instrumentation from __init and __head (Ritesh Harjani, Kees Cook) - Refactor and rename stackleak feature to support Clang - Add KUnit test for seq_buf API - Fix KUnit fortify test under LTO * tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (22 commits) sched/task_stack: Add missing const qualifier to end_of_stack() kstack_erase: Support Clang stack depth tracking kstack_erase: Add -mgeneral-regs-only to silence Clang warnings init.h: Disable sanitizer coverage for __init and __head kstack_erase: Disable kstack_erase for all of arm compressed boot code x86: Handle KCOV __init vs inline mismatches arm64: Handle KCOV __init vs inline mismatches s390: Handle KCOV __init vs inline mismatches arm: Handle KCOV __init vs inline mismatches mips: Handle KCOV __init vs inline mismatch powerpc/mm/book3s64: Move kfence and debug_pagealloc related calls to __init section configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON configs/hardening: Enable CONFIG_KSTACK_ERASE stackleak: Split KSTACK_ERASE_CFLAGS from GCC_PLUGINS_CFLAGS stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth stackleak: Rename STACKLEAK to KSTACK_ERASE seq_buf: Introduce KUnit tests string: Group str_has_prefix() and strstarts() kunit/fortify: Add back "volatile" for sizeof() constants acpi: nfit: intel: avoid multiple -Wflex-array-member-not-at-end warnings ...