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, 33 insertions, 0 deletions

diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
new file mode 100644
index 000000000..7f5137dc0
--- /dev/null
+++ b/drivers/input/serio/Makefile
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the input core drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_SERIO)		+= serio.o
+obj-$(CONFIG_SERIO_I8042)	+= i8042.o
+obj-$(CONFIG_SERIO_PARKBD)	+= parkbd.o
+obj-$(CONFIG_SERIO_SERPORT)	+= serport.o
+obj-$(CONFIG_SERIO_RPCKBD)	+= rpckbd.o
+obj-$(CONFIG_SERIO_SA1111)	+= sa1111ps2.o
+obj-$(CONFIG_SERIO_AMBAKMI)	+= ambakmi.o
+obj-$(CONFIG_SERIO_Q40KBD)	+= q40kbd.o
+obj-$(CONFIG_SERIO_GSCPS2)	+= gscps2.o
+obj-$(CONFIG_HP_SDC)		+= hp_sdc.o
+obj-$(CONFIG_HIL_MLC)		+= hp_sdc_mlc.o hil_mlc.o
+obj-$(CONFIG_SERIO_PCIPS2)	+= pcips2.o
+obj-$(CONFIG_SERIO_PS2MULT)	+= ps2mult.o
+obj-$(CONFIG_SERIO_MACEPS2)	+= maceps2.o
+obj-$(CONFIG_SERIO_SGI_IOC3)	+= ioc3kbd.o
+obj-$(CONFIG_SERIO_LIBPS2)	+= libps2.o
+obj-$(CONFIG_SERIO_RAW)		+= serio_raw.o
+obj-$(CONFIG_SERIO_AMS_DELTA)	+= ams_delta_serio.o
+obj-$(CONFIG_SERIO_ALTERA_PS2)	+= altera_ps2.o
+obj-$(CONFIG_SERIO_ARC_PS2)	+= arc_ps2.o
+obj-$(CONFIG_SERIO_APBPS2)	+= apbps2.o
+obj-$(CONFIG_SERIO_OLPC_APSP)	+= olpc_apsp.o
+obj-$(CONFIG_HYPERV_KEYBOARD)	+= hyperv-keyboard.o
+obj-$(CONFIG_SERIO_SUN4I_PS2)	+= sun4i-ps2.o
+obj-$(CONFIG_SERIO_GPIO_PS2)	+= ps2-gpio.o
+obj-$(CONFIG_USERIO)		+= userio.o