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, 41 insertions, 0 deletions

diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
new file mode 100644
index 000000000..3ee883c87
--- /dev/null
+++ b/drivers/memory/Makefile
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for memory devices
+#
+
+obj-$(CONFIG_DDR)		+= jedec_ddr_data.o
+ifeq ($(CONFIG_DDR),y)
+obj-$(CONFIG_OF)		+= of_memory.o
+endif
+obj-$(CONFIG_ARM_PL172_MPMC)	+= pl172.o
+obj-$(CONFIG_ATMEL_EBI)		+= atmel-ebi.o
+obj-$(CONFIG_BRCMSTB_DPFE)	+= brcmstb_dpfe.o
+obj-$(CONFIG_BRCMSTB_MEMC)	+= brcmstb_memc.o
+obj-$(CONFIG_TI_AEMIF)		+= ti-aemif.o
+obj-$(CONFIG_TI_EMIF)		+= emif.o
+obj-$(CONFIG_OMAP_GPMC)		+= omap-gpmc.o
+obj-$(CONFIG_FSL_CORENET_CF)	+= fsl-corenet-cf.o
+obj-$(CONFIG_FSL_IFC)		+= fsl_ifc.o
+obj-$(CONFIG_MVEBU_DEVBUS)	+= mvebu-devbus.o
+obj-$(CONFIG_JZ4780_NEMC)	+= jz4780-nemc.o
+obj-$(CONFIG_MTK_SMI)		+= mtk-smi.o
+obj-$(CONFIG_DA8XX_DDRCTL)	+= da8xx-ddrctl.o
+obj-$(CONFIG_PL353_SMC)		+= pl353-smc.o
+obj-$(CONFIG_RENESAS_RPCIF)	+= renesas-rpc-if.o
+obj-$(CONFIG_STM32_FMC2_EBI)	+= stm32-fmc2-ebi.o
+obj-$(CONFIG_STM32_OMM)		+= stm32_omm.o
+
+obj-$(CONFIG_SAMSUNG_MC)	+= samsung/
+obj-$(CONFIG_TEGRA_MC)		+= tegra/
+obj-$(CONFIG_TI_EMIF_SRAM)	+= ti-emif-sram.o
+obj-$(CONFIG_FPGA_DFL_EMIF)	+= dfl-emif.o
+
+ti-emif-sram-objs		:= ti-emif-pm.o ti-emif-sram-pm.o
+
+$(obj)/ti-emif-sram-pm.o: $(obj)/ti-emif-asm-offsets.h
+
+$(obj)/ti-emif-asm-offsets.h: $(obj)/emif-asm-offsets.s FORCE
+	$(call filechk,offsets,__TI_EMIF_ASM_OFFSETS_H__)
+
+targets += emif-asm-offsets.s
+clean-files += ti-emif-asm-offsets.h