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, 131 insertions, 0 deletions

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
new file mode 100644
index 000000000..b292e7ca5
--- /dev/null
+++ b/drivers/clk/imx/Kconfig
@@ -0,0 +1,131 @@
+# SPDX-License-Identifier: GPL-2.0
+# common clock support for NXP i.MX SoC family.
+config MXC_CLK
+	tristate "IMX clock"
+	depends on ARCH_MXC || COMPILE_TEST
+
+config MXC_CLK_SCU
+	tristate
+
+config CLK_IMX1
+	def_bool SOC_IMX1
+	select MXC_CLK
+
+config CLK_IMX25
+	def_bool SOC_IMX25
+	select MXC_CLK
+
+config CLK_IMX27
+	def_bool SOC_IMX27
+	select MXC_CLK
+
+config CLK_IMX31
+	def_bool SOC_IMX31
+	select MXC_CLK
+
+config CLK_IMX35
+	def_bool SOC_IMX35
+	select MXC_CLK
+
+config CLK_IMX5
+	def_bool SOC_IMX5
+	select MXC_CLK
+
+config CLK_IMX6Q
+	def_bool SOC_IMX6Q
+	select MXC_CLK
+
+config CLK_IMX6SL
+	def_bool SOC_IMX6SL
+	select MXC_CLK
+
+config CLK_IMX6SLL
+	def_bool SOC_IMX6SLL
+	select MXC_CLK
+
+config CLK_IMX6SX
+	def_bool SOC_IMX6SX
+	select MXC_CLK
+
+config CLK_IMX6UL
+	def_bool SOC_IMX6UL
+	select MXC_CLK
+
+config CLK_IMX7D
+	def_bool SOC_IMX7D
+	select MXC_CLK
+
+config CLK_IMX7ULP
+	def_bool SOC_IMX7ULP
+	select MXC_CLK
+
+config CLK_VF610
+	def_bool SOC_VF610
+	select MXC_CLK
+
+config CLK_IMX8MM
+	tristate "IMX8MM CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MM CCM Clock Driver
+
+config CLK_IMX8MN
+	tristate "IMX8MN CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MN CCM Clock Driver
+
+config CLK_IMX8MP
+	tristate "IMX8MP CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	select AUXILIARY_BUS if RESET_CONTROLLER
+	help
+	    Build the driver for i.MX8MP CCM Clock Driver
+
+config CLK_IMX8MQ
+	tristate "IMX8MQ CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MQ CCM Clock Driver
+
+config CLK_IMX8QXP
+	tristate "IMX8QXP SCU Clock"
+	depends on (ARCH_MXC && ARM64) || COMPILE_TEST
+	depends on IMX_SCU && HAVE_ARM_SMCCC
+	select MXC_CLK_SCU
+	select MXC_CLK
+	help
+	  Build the driver for IMX8QXP SCU based clocks.
+
+config CLK_IMX8ULP
+	tristate "IMX8ULP CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	select AUXILIARY_BUS
+	help
+	    Build the driver for i.MX8ULP CCM Clock Driver
+
+config CLK_IMX93
+	tristate "IMX93 CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX93 CCM Clock Driver
+
+config CLK_IMX95_BLK_CTL
+	tristate "IMX95 Clock Driver for BLK CTL"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the clock driver for i.MX95 BLK CTL
+
+config CLK_IMXRT1050
+	tristate "IMXRT1050 CCM Clock Driver"
+	depends on SOC_IMXRT || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MXRT1050 CCM Clock Driver