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, 55 insertions, 0 deletions

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
new file mode 100644
index 000000000..47870e29c
--- /dev/null
+++ b/drivers/soc/fsl/Kconfig
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# NXP/Freescale QorIQ series SOC drivers
+#
+
+menu "NXP/Freescale QorIQ SoC drivers"
+
+source "drivers/soc/fsl/qbman/Kconfig"
+source "drivers/soc/fsl/qe/Kconfig"
+
+config FSL_GUTS
+	bool
+	select SOC_BUS
+	help
+	  The global utilities block controls power management, I/O device
+	  enabling, power-onreset(POR) configuration monitoring, alternate
+	  function selection for multiplexed signals,and clock control.
+	  This driver is to manage and access global utilities block.
+	  Initially only reading SVR and registering soc device are supported.
+	  Other guts accesses, such as reading RCW, should eventually be moved
+	  into this driver as well.
+
+config FSL_MC_DPIO
+        tristate "QorIQ DPAA2 DPIO driver"
+        depends on FSL_MC_BUS && NET
+        select SOC_BUS
+        select FSL_GUTS
+        select DIMLIB
+        help
+	  Driver for the DPAA2 DPIO object.  A DPIO provides queue and
+	  buffer management facilities for software to interact with
+	  other DPAA2 objects. This driver does not expose the DPIO
+	  objects individually, but groups them under a service layer
+	  API.
+
+config DPAA2_CONSOLE
+	tristate "QorIQ DPAA2 console driver"
+	depends on OF && (ARCH_LAYERSCAPE || COMPILE_TEST)
+	default ARCH_LAYERSCAPE
+	help
+	  Console driver for DPAA2 platforms. Exports 2 char devices,
+	  /dev/dpaa2_mc_console and /dev/dpaa2_aiop_console,
+	  which can be used to dump the Management Complex and AIOP
+	  firmware logs.
+
+config FSL_RCPM
+	bool "Freescale RCPM support"
+	depends on PM_SLEEP && (ARM || ARM64)
+	help
+	  The NXP QorIQ Processors based on ARM Core have RCPM module
+	  (Run Control and Power Management), which performs all device-level
+	  tasks associated with power management, such as wakeup source control.
+	  Note that currently this driver will not support PowerPC based
+	  QorIQ processor.
+endmenu