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, 32 insertions, 0 deletions

diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile
new file mode 100644
index 000000000..a0715cdfc
--- /dev/null
+++ b/drivers/clk/tegra/Makefile
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-y					+= clk.o
+obj-y					+= clk-audio-sync.o
+obj-y					+= clk-device.o
+obj-y					+= clk-dfll.o
+obj-y					+= clk-divider.o
+obj-y					+= clk-periph.o
+obj-y					+= clk-periph-fixed.o
+obj-y					+= clk-periph-gate.o
+obj-y					+= clk-pll.o
+obj-y					+= clk-pll-out.o
+obj-y					+= clk-sdmmc-mux.o
+obj-y					+= clk-super.o
+obj-y					+= clk-tegra-audio.o
+obj-y					+= clk-tegra-periph.o
+obj-y					+= clk-tegra-fixed.o
+obj-y					+= clk-tegra-super-cclk.o
+obj-y					+= clk-tegra-super-gen4.o
+obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += clk-tegra20.o
+obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= clk-tegra20-emc.o
+obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += clk-tegra30.o
+obj-$(CONFIG_ARCH_TEGRA_3x_SOC)		+= clk-tegra20-emc.o
+obj-$(CONFIG_ARCH_TEGRA_114_SOC)	+= clk-tegra114.o
+obj-$(CONFIG_ARCH_TEGRA_124_SOC)	+= clk-tegra124.o
+obj-$(CONFIG_TEGRA_CLK_DFLL)		+= clk-tegra124-dfll-fcpu.o
+obj-$(CONFIG_TEGRA124_CLK_EMC)		+= clk-tegra124-emc.o
+obj-$(CONFIG_ARCH_TEGRA_132_SOC)	+= clk-tegra124.o
+obj-y					+= cvb.o
+obj-$(CONFIG_ARCH_TEGRA_210_SOC)	+= clk-tegra210.o
+obj-$(CONFIG_ARCH_TEGRA_210_SOC)	+= clk-tegra210-emc.o
+obj-$(CONFIG_CLK_TEGRA_BPMP)		+= clk-bpmp.o
+obj-y					+= clk-utils.o