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, 48 insertions, 0 deletions

diff --git a/arch/m68k/coldfire/Makefile b/arch/m68k/coldfire/Makefile
new file mode 100644
index 000000000..c56bc0dc7
--- /dev/null
+++ b/arch/m68k/coldfire/Makefile
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the m68knommu kernel.
+#
+
+#
+# If you want to play with the HW breakpoints then you will
+# need to add define this,  which will give you a stack backtrace
+# on the console port whenever a DBG interrupt occurs. You have to
+# set up you HW breakpoints to trigger a DBG interrupt:
+#
+# ccflags-y := -DTRAP_DBG_INTERRUPT
+# asflags-y := -DTRAP_DBG_INTERRUPT
+#
+
+asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
+
+obj-$(CONFIG_COLDFIRE)	+= cache.o clk.o device.o entry.o vectors.o
+obj-$(CONFIG_M5206)	+= m5206.o intc.o reset.o
+obj-$(CONFIG_M5206e)	+= m5206.o intc.o reset.o
+obj-$(CONFIG_M520x)	+= m520x.o intc-simr.o reset.o
+obj-$(CONFIG_M523x)	+= m523x.o dma_timer.o intc-2.o reset.o
+obj-$(CONFIG_M5249)	+= m5249.o intc.o intc-5249.o reset.o
+obj-$(CONFIG_M525x)	+= m525x.o intc.o intc-525x.o reset.o
+obj-$(CONFIG_M527x)	+= m527x.o intc-2.o reset.o
+obj-$(CONFIG_M5272)	+= m5272.o intc-5272.o
+obj-$(CONFIG_M528x)	+= m528x.o intc-2.o reset.o
+obj-$(CONFIG_M5307)	+= m5307.o intc.o reset.o
+obj-$(CONFIG_M53xx)	+= m53xx.o intc-simr.o reset.o
+obj-$(CONFIG_M5407)	+= m5407.o intc.o reset.o
+obj-$(CONFIG_M54xx)	+= m54xx.o intc-2.o
+obj-$(CONFIG_M5441x)	+= m5441x.o intc-simr.o reset.o
+
+obj-$(CONFIG_COLDFIRE_PIT_TIMER) += pit.o
+obj-$(CONFIG_COLDFIRE_TIMERS)	 += timers.o
+obj-$(CONFIG_COLDFIRE_SLTIMERS)	 += sltimers.o
+
+obj-$(CONFIG_NETtel)	+= nettel.o
+obj-$(CONFIG_CLEOPATRA)	+= nettel.o
+obj-$(CONFIG_FIREBEE)	+= firebee.o
+obj-$(CONFIG_MCF8390)	+= mcf8390.o
+obj-$(CONFIG_AMCORE)	+= amcore.o
+obj-$(CONFIG_STMARK2)	+= stmark2.o
+
+obj-$(CONFIG_PCI)	+= pci.o
+
+obj-y			+= gpio.o
+obj-y			+= head.o