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, 45 insertions, 0 deletions

diff --git a/drivers/pinctrl/mediatek/Makefile b/drivers/pinctrl/mediatek/Makefile
new file mode 100644
index 000000000..6ee3833dc
--- /dev/null
+++ b/drivers/pinctrl/mediatek/Makefile
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0
+# Core
+obj-$(CONFIG_EINT_MTK)			+= mtk-eint.o
+obj-$(CONFIG_PINCTRL_MTK)		+= pinctrl-mtk-common.o
+obj-$(CONFIG_PINCTRL_MTK_V2)		+= pinctrl-mtk-common-v2.o
+obj-$(CONFIG_PINCTRL_MTK_MTMIPS)	+= pinctrl-mtmips.o
+obj-$(CONFIG_PINCTRL_MTK_MOORE)		+= pinctrl-moore.o
+obj-$(CONFIG_PINCTRL_MTK_PARIS)		+= pinctrl-paris.o
+
+# SoC Drivers
+obj-$(CONFIG_PINCTRL_MT7620)		+= pinctrl-mt7620.o
+obj-$(CONFIG_PINCTRL_MT7621)		+= pinctrl-mt7621.o
+obj-$(CONFIG_PINCTRL_MT76X8)		+= pinctrl-mt76x8.o
+obj-$(CONFIG_PINCTRL_RT2880)		+= pinctrl-rt2880.o
+obj-$(CONFIG_PINCTRL_RT305X)		+= pinctrl-rt305x.o
+obj-$(CONFIG_PINCTRL_RT3883)		+= pinctrl-rt3883.o
+obj-$(CONFIG_PINCTRL_MT2701)		+= pinctrl-mt2701.o
+obj-$(CONFIG_PINCTRL_MT2712)		+= pinctrl-mt2712.o
+obj-$(CONFIG_PINCTRL_MT8135)		+= pinctrl-mt8135.o
+obj-$(CONFIG_PINCTRL_MT8127)		+= pinctrl-mt8127.o
+obj-$(CONFIG_PINCTRL_MT6765)		+= pinctrl-mt6765.o
+obj-$(CONFIG_PINCTRL_MT6779)		+= pinctrl-mt6779.o
+obj-$(CONFIG_PINCTRL_MT6795)		+= pinctrl-mt6795.o
+obj-$(CONFIG_PINCTRL_MT6797)		+= pinctrl-mt6797.o
+obj-$(CONFIG_PINCTRL_MT6858)		+= pinctrl-mt6858.o
+obj-$(CONFIG_PINCTRL_MT6878)		+= pinctrl-mt6878.o
+obj-$(CONFIG_PINCTRL_MT6893)		+= pinctrl-mt6893.o
+obj-$(CONFIG_PINCTRL_MT7622)		+= pinctrl-mt7622.o
+obj-$(CONFIG_PINCTRL_MT7623)		+= pinctrl-mt7623.o
+obj-$(CONFIG_PINCTRL_MT7629)		+= pinctrl-mt7629.o
+obj-$(CONFIG_PINCTRL_MT7981)		+= pinctrl-mt7981.o
+obj-$(CONFIG_PINCTRL_MT7986)		+= pinctrl-mt7986.o
+obj-$(CONFIG_PINCTRL_MT7988)		+= pinctrl-mt7988.o
+obj-$(CONFIG_PINCTRL_MT8167)		+= pinctrl-mt8167.o
+obj-$(CONFIG_PINCTRL_MT8173)		+= pinctrl-mt8173.o
+obj-$(CONFIG_PINCTRL_MT8183)		+= pinctrl-mt8183.o
+obj-$(CONFIG_PINCTRL_MT8186)		+= pinctrl-mt8186.o
+obj-$(CONFIG_PINCTRL_MT8188)		+= pinctrl-mt8188.o
+obj-$(CONFIG_PINCTRL_MT8189)            += pinctrl-mt8189.o
+obj-$(CONFIG_PINCTRL_MT8192)		+= pinctrl-mt8192.o
+obj-$(CONFIG_PINCTRL_MT8195)		+= pinctrl-mt8195.o
+obj-$(CONFIG_PINCTRL_MT8196)		+= pinctrl-mt8196.o
+obj-$(CONFIG_PINCTRL_MT8365)		+= pinctrl-mt8365.o
+obj-$(CONFIG_PINCTRL_MT8516)		+= pinctrl-mt8516.o
+obj-$(CONFIG_PINCTRL_MT6397)		+= pinctrl-mt6397.o