kernel/git/stable/linux.git/drivers/acpi, branch master

Revert "ACPI: scan: Defer device power initialization"

2026-08-27T14:03:20+00:00

Revert commit dc948f8b384a ("ACPI: scan: Defer device power initialization") that is incomplete and may cause ACPI power management of devices to fail. The problem is that PCI devices are associated with the corresponding ACPI device objects before acpi_bus_attach() runs for them, so after commit dc948f8b384a, ACPI power management will not be initialized for them before making that association. Consequently, the reference counting of ACPI power resources may not work as expected going forward and power management issues may appear. If they appear, they may be elusive and hard to diagnose. While this is fixable, I am not sure if fixing it on top of commit dc948f8b384a is the best way to go, so it is better to revert that commit for now and revisit the whole thing in the next cycle. Signed-off-by: Rafael J. Wysocki Link: https://patch.msgid.link/6029658.DvuYhMxLoT@rafael.j.wysocki

Merge tag 'acpi-7.3-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2026-08-26T21:06:08+00:00

Pull more ACPI support updates from Rafael Wysocki: "These update documentation to reflect recent changes in the upstream ACPICA project, fix issues in the core ACPI device enumeration code (one of which has been introduced recently), improve the primary "physical" device lookup for ACPI device objects in that code, and update ACPI device drivers: - Update MAINTAINERS, CREDITS and ACPI subsystem documentation to reflect recent changes in the upstream ACPICA project (Rafael Wysocki) - Prevent the core ACPI enumeration code from combining device resources that overlap completely in order to avoid resource conflicts during platform device registration because there are drivers that expect such resources to be present (Rafael Wysocki) - Defer device power initialization during ACPI-based device enumeration to the point when the given device is known to be present and functional and all of its dependencies have been met (Peixin Xie) - Fix bus ID cleanup on device_add() failures during ACPI device object registration (Hongyan Xu) - Introduce a new helper function for looking up the primary "physical" device for a given ACPI device object and update the core ACPI device enumeration code to use that function (Rafael Wysocki) - Protect all battery properties with a separated mutex in the ACPI battery driver to prevent race conditions from occurring and avoid evaluating the _BST ACPI control method multiple times in parallel for the same battery device (Rong Zhang) - Add DMI quirk for the Razer Blade Pro 17 early 2020 lid switch to the ACPI button driver (Robin Everaars) - Convert fixed clock rates in the ACPI driver for AMD SoCs (APD) to use HZ_PER_MHZ and add a clock frequency for the HJMC01 I2C controller to it (Hongnan Li and Xiangyang Yu) - Fix a stack buffer overflow in query_capability() in the ACPI platform firmware runtime update driver (Anirudh Prasad)" * tag 'acpi-7.3-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI: button: Add DMI quirk for Razer Blade Pro 17 early 2020 lid switch ACPI: scan: Do not combine resources that overlap completely ACPI: Update upstream ACPICA repository URL in documentation ACPI: Update MAINTAINERS entry for ACPICA ACPI: Add Bob Moore to CREDITS ACPI: pfr_update: fix stack buffer overflow in query_capability() ACPI: scan: Defer device power initialization ACPI: APD: Add clock frequency for HJMC01 I2C controller ACPI: APD: Convert fixed clock rates to use HZ_PER_MHZ ACPI: scan: Use acpi_bus_get_primary_device() ACPI: platform: Use acpi_bus_get_primary_device() ACPI: bus: Introduce acpi_bus_get_primary_device() ACPI: scan: fix bus ID cleanup on device_add() failures ACPI: battery: Protect all properties with a separated mutex

Merge branches 'acpi-battery', 'acpi-button', 'acpi-soc' and 'acpi-pfrut'

2026-08-26T17:26:49+00:00

Merge updates of assorted ACPI drivers for 7.3-rc1: - Protect all battery properties with a separated mutex in the ACPI battery driver to prevent race conditions from occurring and avoid evaluating the _BST ACPI control method multiple times in parallel for the same battery device (Rong Zhang) - Add DMI quirk for Razer Blade Pro 17 early 2020 lid switch to the ACPI button driver (Robin Everaars) - Convert fixed clock rates in the ACPI driver for AMD SoCs (APD) to use HZ_PER_MHZ and add a clock frequency for the HJMC01 I2C controller to it (Hongnan Li and Xiangyang Yu) - Fix a stack buffer overflow in query_capability() in the ACPI platform firmware runtime update driver (Anirudh Prasad) * acpi-battery: ACPI: battery: Protect all properties with a separated mutex * acpi-button: ACPI: button: Add DMI quirk for Razer Blade Pro 17 early 2020 lid switch * acpi-soc: ACPI: APD: Add clock frequency for HJMC01 I2C controller ACPI: APD: Convert fixed clock rates to use HZ_PER_MHZ * acpi-pfrut: ACPI: pfr_update: fix stack buffer overflow in query_capability()

Merge branch 'acpi-bus'

2026-08-26T17:22:52+00:00

Merge changes related to primary "physical" device lookup for a given ACPI device object that include the introduction of a new lookup helper function and core ACPI device enumeration code updates putting that new function to use (Rafael Wysocki) * acpi-bus: ACPI: scan: Use acpi_bus_get_primary_device() ACPI: platform: Use acpi_bus_get_primary_device() ACPI: bus: Introduce acpi_bus_get_primary_device()

Merge branch 'acpi-scan'

2026-08-26T17:14:10+00:00

Merge core ACPI device enumeration code changes for 7.3-rc1: - Prevent the core ACPI enumeration code from combining device resources that overlap completely in order to avoid resource conflicts during platform device registration because there are drivers that expect such resources to be present (Rafael Wysocki) - Defer device power initialization during ACPI-based device enumeration to the point when the given device is known to be present and functional and all of its dependencies have been met (Peixin Xie) - Fix bus ID cleanup on device_add() failures during ACPI device object registration (Hongyan Xu) * acpi-scan: ACPI: scan: Do not combine resources that overlap completely ACPI: scan: Defer device power initialization ACPI: scan: fix bus ID cleanup on device_add() failures

ACPI: button: Add DMI quirk for Razer Blade Pro 17 early 2020 lid switch

2026-08-21T19:33:33+00:00

The lid switch reports "close" but can miss the matching "open", leaving _LID closed after resume. systemd-logind then suspends the system again roughly every 35 seconds. Reading the embedded controller's PSTA byte while _LID is stale shows that bit 0x04 is set, which the DSDT treats as open. The DSDT returns the cached LIDS byte from _LID. Its wake path aborts in RTEC on an unhandled SystemCMOS region before copying PSTA to LIDS. Initialize the lid state to open on resume, matching the existing quirk for the Razer Blade Stealth 13 late 2019. With button.lid_init_state=open, a physical close suspended once and resume reported open without another suspend. Signed-off-by: Robin Everaars Link: https://patch.msgid.link/20260817141414.213075-1-robineveraars@pm.me Signed-off-by: Rafael J. Wysocki

ACPI: scan: Do not combine resources that overlap completely

2026-08-21T14:00:17+00:00

Commit f234fdaae1ca ("ACPI: scan: Avoid registering platform devices with resource overlaps") attempted to avoid platform device registration errors due to overlaps of resources of the same type returned by the same _CRS object in the ACPI tables. It did that by combining two or more overlapping resources into one, but it went too far and also caused resources that overlap completely to be combined which broke the arm-cmn driver that expects two MMIO resources to be present for each device it binds to and it expects those two resources to overlap completely. Address this issue by adding checks for completely overlapping resources to acpi_platform_adjust_resources() and add a comment explaining what is done there. Fixes: f234fdaae1ca ("ACPI: scan: Avoid registering platform devices with resource overlaps") Reported-by: Nathan Chancellor Tested-by: Nathan Chancellor Closes: https://lore.kernel.org/linux-acpi/20260819003752.GA3063251@ax162/ Signed-off-by: Rafael J. Wysocki Reviewed-by: Jarkko Sakkinen Link: https://patch.msgid.link/12955564.O9o76ZdvQC@rafael.j.wysocki

Merge tag 'cxl-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl

2026-08-20T22:02:09+00:00

Pull CXL updates from Dave Jiang: "This includes the remaining patches to complete the basic support for CXL type2 (accelerators) drivers by the CXL core. A set of unit testing support to catch regressions for the CXL core type2 exported functions has also been added. The actual CXL type 2 driver support for the AMD Solarflare NIC driver has been picked up by net-dev. A set of preparatory patches has been picked up from the CXL port error handling series in order to reduce the number of patches in that series for review. The rest of that series is getting close to be merged but was not ready for the 7.3 merge window. There are also a number of misc patches and a large number of bug fixes against pre-existing issues flagged by sashiko reviews as contributors post new patches on the mailing list. We will continue to work through the sashiko raised issues as they show up." * tag 'cxl-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (35 commits) cxl/Documentation: Spell out globbed sysfs attribute names cxl: Rename find_cxl_port() to find_cxl_port_by_dport() cxl: Tighten CPER kfifo registration API and symbol visibility acpi/apei/ghes: Use raw_spinlock_t for CXL CPER work locks cxl/ras: Fix cxl_rch_get_aer_severity() wrong severity register cxl/ras: Fix cxl_rch_get_aer_info() out-of-bounds AER register read cxl/test: Assign one mock memdev a full-width serial number cxl/core: Format the memdev serial number as unsigned in TP_printk cxl/pmem: Format the nvdimm serial number as unsigned decimal cxl: Use %pe to print error pointers cxl/region: Use __free(put_device) in find_pos_and_ways() cxl/region: Fix use-after-free in find_pos_and_ways() error path cxl: Deny Features commands on the RAW mailbox path cxl/features: Clamp Get Feature output size to the remaining buffer cxl/features: Reject Set Features output buffer smaller than the header cxl/features: Reject Get Feature count larger than the output buffer cxl/port: Restart port enumeration when a sibling adds the dport first cxl/features: Serialize multi-part Get/Set Feature transfers cxl/pci: Honor -EPROBE_DEFER from component register setup cxl/mbox: Break poison list loop on an empty payload ...

Merge tag 'riscv-for-linus-7.3-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

2026-08-20T21:53:54+00:00

Pull RISC-V updates from Paul Walmsley - Add initial definitions and discovery for the Smcsrind, Sscsrind, Smcntrpmf, Ssccfg, Smcdeleg, Zicclsm, Ziccamoa, Ziccif, Ziccrse, Za64rs, and Ssqosid RISC-V ISA extensions - Improve the RISC-V update_mmu_cache_range() implementation by using flush-by-ASID, enabling performance improvements on microarchitectures that support related optimizations; and by taking advantage of the Svinval RISC-V ISA extension on microarchitectures that support it - Shrink CFI shadow stack allocation further (to 512MB) to save virtual address space (and physical memory on systems with strict overcommit policies) - Add initial CPU context switch support for QoS tagging (Ssqosid) - Change our vector misaligned access speed test code to be synchronous, avoiding a bunch of bugs related to unnecessary asynchronicity - Enable ARCH_HAS_ACPI_TABLE_UPGRADE for RISC-V to help with ACPI table debugging (similar to ARM64 and x86) - Extract vDSO section offsets at build time, rather than run time, to avoid the boot time overhead - Use assembler directives to control the use of instructions from the RISC-V ISA extensions Zacas and Zabha, rather than compiler -march flags that could affect the whole kernel (similar to ARM64) - Add a kselftest for kprobes support for the c.jal instruction on RISC-V - When UEFI runtime services are available, use them to restart and power off - Fix ARCH_HAS_ACPI_TABLE_UPGRADE for RISC-V by adding a missing include file to the ACPI code - Move contiguous DMA memory reservation later in the boot, to ensure that the correct global and per-node pools are allocated when CONFIG_CMA_SIZE_PERNUMA is enabled - Disallow probes on breakpoint handlers to avoid recursing indefinitely into do_trap_break() - Patch the compat vDSO during runtime alternatives processing, not only the standard vDSO - Remove some leftover XIP support elements missed by commit 9b3a2be84803 ("riscv: Remove support for XIP kernel") - Fix broadcast timer switching in ACPI LPI power states by implementing a RISC-V version of arch_get_idle_state_flags() - Miscellaneous fixes, including: vDSO makefile simplification; marking our default_power_off() as __noreturn; error path fixes in the PMU SBI perf driver; RISC-V extension capitalization consistency; the use of BIT() macros in one of our include files; and some documentation fixes * tag 'riscv-for-linus-7.3-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (39 commits) RISC-V: hwprobe: Use BIT macro to avoid warnings riscv: alternative: Also patch the compat vDSO riscv: alternative: Use the statically extracted vDSO section offsets riscv: vdso: Add symbols for the alternative section boundaries riscv: Add Ziccamoa, Ziccif, Ziccrse, and Za64rs to cpufeature and hwprobe riscv: Add Zicclsm to cpufeature and hwprobe riscv: cpufeature: Clarify ISA spec version for canonical order riscv: Standardize extension capitalization riscv: kprobes: Prevent probes in breakpoint handlers riscv: cmpxchg: Use .option arch for Zacas and Zabha riscv: acpi: Handle LPI architectural context loss flags riscv: further remove XIP riscv: Add support for srmcfg CSR from Ssqosid extension riscv: Detect the Ssqosid extension dt-bindings: riscv: Add Ssqosid extension description dt-bindings: riscv: add Counter delegation ISA extensions description RISC-V: Add Ssccfg/Smcdeleg ISA extension definition and parsing RISC-V: Add Ssccfg extension CSR definition dt-bindings: riscv: add Smcntrpmf ISA extension description RISC-V: Add Smcntrpmf extension parsing ...

ACPI: pfr_update: fix stack buffer overflow in query_capability()

2026-08-20T19:29:49+00:00

query_capability() copies four ACPI buffer objects returned by the firmware _DSM into fixed-size u8[16] fields in struct pfru_update_cap_info using memcpy with the firmware-supplied length: memcpy(&cap_hdr->code_type, elements[CAP_CODE_TYPE_IDX].buffer.pointer, elements[CAP_CODE_TYPE_IDX].buffer.length); The same pattern repeats for drv_type, platform_id, and oem_id. If the firmware returns buffer.length > 16 for any of these fields, memcpy writes past the destination array. struct pfru_update_cap_info is stack-allocated in pfru_ioctl(). Confirmed with KASAN on 7.2-rc6: three stack-out-of-bounds reports are generated when a DSM returns 64-byte buffers, with writes reaching 44 bytes past the end of cap_hdr's [64, 156) frame window into adjacent stack redzones. Introduce a helper pointer to out_obj->package.elements and use it to validate each buffer length against its destination field size before copying, returning -EINVAL if the firmware supplies an oversized buffer. Fixes: 0db89fa243e5 ("ACPI: Introduce Platform Firmware Runtime Update device driver") Cc: All applicable Signed-off-by: Anirudh Prasad Link: https://patch.msgid.link/1a001e1fee9.637da6dc3533246.238498880682901704@a0rg.com Signed-off-by: Rafael J. Wysocki