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/thunderbolt/Kconfig | 78 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 drivers/thunderbolt/Kconfig (limited to 'drivers/thunderbolt/Kconfig') diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig new file mode 100644 index 000000000..294b3227a --- /dev/null +++ b/drivers/thunderbolt/Kconfig @@ -0,0 +1,78 @@ +# SPDX-License-Identifier: GPL-2.0-only +menuconfig USB4 + tristate "Unified support for USB4 and Thunderbolt" + depends on PCI + select APPLE_PROPERTIES if EFI_STUB && X86 + select CRC32 + select CRYPTO_LIB_SHA256 + select CRYPTO_LIB_UTILS + select NVMEM + help + USB4 and Thunderbolt driver. USB4 is the public specification + based on the Thunderbolt 3 protocol. This driver is required if + you want to hotplug Thunderbolt and USB4 compliant devices on + Apple hardware or on PCs with Intel Falcon Ridge or newer. + + To compile this driver a module, choose M here. The module will be + called thunderbolt. + +if USB4 + +config USB4_CONFIGFS + def_tristate USB4 + depends on CONFIGFS_FS && !(USB4=y && CONFIGFS_FS=m) + +config USB4_DEBUGFS_WRITE + bool "Enable write by debugfs to configuration spaces (DANGEROUS)" + help + Enables writing to device configuration registers through + debugfs interface. You can use tools such as Thunderbolt/USB4 + debugging tools to access these registers. For more + information see: + + https://github.com/intel/tbtools + + Only enable this if you know what you are doing! Never enable + this for production systems or distro kernels. + +config USB4_DEBUGFS_MARGINING + bool "Expose receiver lane margining operations under USB4 ports and retimers (DANGEROUS)" + depends on DEBUG_FS + depends on USB4_DEBUGFS_WRITE + help + Enables hardware and software based receiver lane margining + support under each USB4 port and retimer, including retimers + on the other side of the cable. Used for electrical quality + and robustness validation during manufacturing. Should not be + enabled by distro kernels. + +config USB4_KUNIT_TEST + bool "KUnit tests" if !KUNIT_ALL_TESTS + depends on USB4 && KUNIT=y + default KUNIT_ALL_TESTS + +config USB4_DMA_TEST + tristate "DMA traffic test driver" + depends on DEBUG_FS + help + This allows sending and receiving DMA traffic through loopback + connection. Loopback connection can be done by either special + dongle that has TX/RX lines crossed, or by simply connecting a + cable back to the host. Only enable this if you know what you + are doing. Normal users and distro kernels should say N here. + + To compile this driver a module, choose M here. The module will be + called thunderbolt_dma_test. + +config USB4_STREAM + tristate "Stream data over Thunderbolt/USB4 cable" + depends on USB4_CONFIGFS + help + This adds support for USB4STREAM protocol that allows two + hosts to stream data directly over Thunderbolt/USB4 cable + through /dev/tbstreamX devices. + + To compile this driver a module, choose M here. The module will be + called thunderbolt_stream. + +endif # USB4 -- cgit v1.3.1