x86/amd_node: Fix PCI device reference counting in amd_smn_init()grafted

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 <sashiko-bot@kernel.org>
Assisted-by: LLM
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Cc: <stable@kernel.org>
Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com

1 files changed, 61 insertions, 0 deletions

diff --git a/sound/soc/sof/Makefile b/sound/soc/sof/Makefile
new file mode 100644
index 000000000..b0b22e6eb
--- /dev/null
+++ b/sound/soc/sof/Makefile
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+
+snd-sof-y := core.o ops.o loader.o ipc.o pcm.o pm.o debug.o topology.o\
+		control.o trace.o iomem-utils.o sof-audio.o stream-ipc.o\
+		fw-file-profile.o
+
+# IPC implementations
+ifneq ($(CONFIG_SND_SOC_SOF_IPC3),)
+snd-sof-y +=	ipc3.o ipc3-loader.o ipc3-topology.o ipc3-control.o ipc3-pcm.o\
+		ipc3-dtrace.o
+endif
+ifneq ($(CONFIG_SND_SOC_SOF_IPC4),)
+snd-sof-y += ipc4.o ipc4-loader.o ipc4-topology.o ipc4-control.o ipc4-pcm.o\
+		ipc4-mtrace.o ipc4-telemetry.o
+endif
+
+# SOF client support
+ifneq ($(CONFIG_SND_SOC_SOF_CLIENT),)
+snd-sof-y += sof-client.o
+endif
+
+snd-sof-$(CONFIG_SND_SOC_SOF_COMPRESS) += compress.o
+
+snd-sof-pci-y := sof-pci-dev.o
+snd-sof-acpi-y := sof-acpi-dev.o
+snd-sof-of-y := sof-of-dev.o
+
+snd-sof-ipc-flood-test-y := sof-client-ipc-flood-test.o
+snd-sof-ipc-msg-injector-y := sof-client-ipc-msg-injector.o
+snd-sof-ipc-kernel-injector-y := sof-client-ipc-kernel-injector.o
+snd-sof-probes-y := sof-client-probes.o
+ifneq ($(CONFIG_SND_SOC_SOF_IPC3),)
+snd-sof-probes-y += sof-client-probes-ipc3.o
+endif
+ifneq ($(CONFIG_SND_SOC_SOF_IPC4),)
+snd-sof-probes-y += sof-client-probes-ipc4.o
+endif
+
+snd-sof-nocodec-y := nocodec.o
+
+snd-sof-utils-y := sof-utils.o
+
+obj-$(CONFIG_SND_SOC_SOF) += snd-sof.o
+obj-$(CONFIG_SND_SOC_SOF_NOCODEC) += snd-sof-nocodec.o
+
+obj-$(CONFIG_SND_SOC_SOF) += snd-sof-utils.o
+
+obj-$(CONFIG_SND_SOC_SOF_ACPI_DEV) += snd-sof-acpi.o
+obj-$(CONFIG_SND_SOC_SOF_OF_DEV) += snd-sof-of.o
+obj-$(CONFIG_SND_SOC_SOF_PCI_DEV) += snd-sof-pci.o
+
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST) += snd-sof-ipc-flood-test.o
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_MSG_INJECTOR) += snd-sof-ipc-msg-injector.o
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_KERNEL_INJECTOR) += snd-sof-ipc-kernel-injector.o
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_PROBES) += snd-sof-probes.o
+
+obj-$(CONFIG_SND_SOC_SOF_INTEL_TOPLEVEL) += intel/
+obj-$(CONFIG_SND_SOC_SOF_IMX_TOPLEVEL) += imx/
+obj-$(CONFIG_SND_SOC_SOF_AMD_TOPLEVEL) += amd/
+obj-$(CONFIG_SND_SOC_SOF_XTENSA) += xtensa/
+obj-$(CONFIG_SND_SOC_SOF_MTK_TOPLEVEL) += mediatek/