From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- drivers/power/sequencing/Kconfig | 49 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 drivers/power/sequencing/Kconfig (limited to 'drivers/power/sequencing/Kconfig') diff --git a/drivers/power/sequencing/Kconfig b/drivers/power/sequencing/Kconfig new file mode 100644 index 000000000..1c5f5820f --- /dev/null +++ b/drivers/power/sequencing/Kconfig @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0-only + +menuconfig POWER_SEQUENCING + tristate "Power Sequencing support" + help + Say Y here to enable the Power Sequencing subsystem. + + This subsystem is designed to control power to devices that share + complex resources and/or require specific power sequences to be run + during power-up. + + If unsure, say no. + +if POWER_SEQUENCING + +config POWER_SEQUENCING_QCOM_WCN + tristate "Qualcomm WCN family PMU driver" + default m if ARCH_QCOM + depends on OF || COMPILE_TEST + help + Say Y here to enable the power sequencing driver for Qualcomm + WCN Bluetooth/WLAN chipsets. + + Typically, a package from the Qualcomm WCN family contains the BT + and WLAN modules whose power is controlled by the PMU module. As the + former two share the power-up sequence which is executed by the PMU, + this driver is needed for correct power control or else we'd risk not + respecting the required delays between enabling Bluetooth and WLAN. + +config POWER_SEQUENCING_TH1520_GPU + tristate "T-HEAD TH1520 GPU power sequencing driver" + depends on (ARCH_THEAD && AUXILIARY_BUS) || COMPILE_TEST + help + Say Y here to enable the power sequencing driver for the TH1520 SoC + GPU. This driver handles the complex clock and reset sequence + required to power on the Imagination BXM GPU on this platform. + +config POWER_SEQUENCING_PCIE_M2 + tristate "PCIe M.2 connector power sequencing driver" + depends on OF + depends on PCI + depends on SERIAL_DEV_BUS + select OF_DYNAMIC + help + Say Y here to enable the power sequencing driver for PCIe M.2 + connectors. This driver handles the power sequencing for the M.2 + connectors exposing multiple interfaces like PCIe, SATA, UART, etc... + +endif -- cgit v1.3.1