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, 87 insertions, 0 deletions

diff --git a/sound/soc/Makefile b/sound/soc/Makefile
new file mode 100644
index 000000000..21d840676
--- /dev/null
+++ b/sound/soc/Makefile
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: GPL-2.0
+snd-soc-core-y := soc-core.o soc-dapm.o soc-jack.o soc-utils.o soc-dai.o soc-component.o
+snd-soc-core-y += soc-pcm.o soc-devres.o soc-ops.o soc-link.o soc-card.o
+snd-soc-core-$(CONFIG_SND_SOC_COMPRESS) += soc-compress.o
+
+ifneq ($(CONFIG_SND_SOC_TOPOLOGY),)
+snd-soc-core-y += soc-topology.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_TOPOLOGY_KUNIT_TEST),)
+# snd-soc-test-y := soc-topology-test.o
+obj-$(CONFIG_SND_SOC_TOPOLOGY_KUNIT_TEST) += soc-topology-test.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_CARD_KUNIT_TEST),)
+obj-$(CONFIG_SND_SOC_CARD_KUNIT_TEST) += soc-card-test.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_UTILS_KUNIT_TEST),)
+# snd-soc-test-y := soc-utils-test.o
+obj-$(CONFIG_SND_SOC_UTILS_KUNIT_TEST) += soc-utils-test.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_OPS_KUNIT_TEST),)
+obj-$(CONFIG_SND_SOC_OPS_KUNIT_TEST) += soc-ops-test.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_GENERIC_DMAENGINE_PCM),)
+snd-soc-core-y += soc-generic-dmaengine-pcm.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_AC97_BUS),)
+snd-soc-core-y += soc-ac97.o
+endif
+
+ifneq ($(CONFIG_SND_SOC_ACPI),)
+snd-soc-acpi-y := soc-acpi.o
+endif
+
+obj-$(CONFIG_SND_SOC_ACPI) += snd-soc-acpi.o
+
+obj-$(CONFIG_SND_SOC_USB) += soc-usb.o
+
+obj-$(CONFIG_SND_SOC)	+= snd-soc-core.o
+obj-$(CONFIG_SND_SOC)	+= codecs/
+obj-$(CONFIG_SND_SOC)	+= generic/
+obj-$(CONFIG_SND_SOC)	+= apple/
+obj-$(CONFIG_SND_SOC)	+= adi/
+obj-$(CONFIG_SND_SOC)	+= amd/
+obj-$(CONFIG_SND_SOC)	+= atmel/
+obj-$(CONFIG_SND_SOC)	+= au1x/
+obj-$(CONFIG_SND_SOC)	+= bcm/
+obj-$(CONFIG_SND_SOC)	+= cirrus/
+obj-$(CONFIG_SND_SOC)	+= dwc/
+obj-$(CONFIG_SND_SOC)	+= fsl/
+obj-$(CONFIG_SND_SOC)	+= google/
+obj-$(CONFIG_SND_SOC)	+= hisilicon/
+obj-$(CONFIG_SND_SOC)	+= jz4740/
+obj-$(CONFIG_SND_SOC)	+= loongson/
+obj-$(CONFIG_SND_SOC)	+= img/
+obj-$(CONFIG_SND_SOC)	+= intel/
+obj-$(CONFIG_SND_SOC)	+= mediatek/
+obj-$(CONFIG_SND_SOC)	+= meson/
+obj-$(CONFIG_SND_SOC)	+= mxs/
+obj-$(CONFIG_SND_SOC)	+= kirkwood/
+obj-$(CONFIG_SND_SOC)	+= pxa/
+obj-$(CONFIG_SND_SOC)	+= qcom/
+obj-$(CONFIG_SND_SOC)	+= renesas/
+obj-$(CONFIG_SND_SOC)	+= rockchip/
+obj-$(CONFIG_SND_SOC)	+= samsung/
+obj-$(CONFIG_SND_SOC)	+= sdca/
+obj-$(CONFIG_SND_SOC)	+= sof/
+obj-$(CONFIG_SND_SOC)   += sophgo/
+obj-$(CONFIG_SND_SOC)	+= spacemit/
+obj-$(CONFIG_SND_SOC)	+= spear/
+obj-$(CONFIG_SND_SOC)	+= sprd/
+obj-$(CONFIG_SND_SOC)	+= starfive/
+obj-$(CONFIG_SND_SOC)	+= sti/
+obj-$(CONFIG_SND_SOC)	+= stm/
+obj-$(CONFIG_SND_SOC)	+= sunxi/
+obj-$(CONFIG_SND_SOC)	+= tegra/
+obj-$(CONFIG_SND_SOC)	+= ti/
+obj-$(CONFIG_SND_SOC)	+= uniphier/
+obj-$(CONFIG_SND_SOC)	+= ux500/
+obj-$(CONFIG_SND_SOC)	+= xilinx/
+obj-$(CONFIG_SND_SOC)	+= xtensa/
+obj-$(CONFIG_SND_SOC)	+= sdw_utils/