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, 59 insertions, 0 deletions

diff --git a/include/dt-bindings/power/r8a779a0-sysc.h b/include/dt-bindings/power/r8a779a0-sysc.h
new file mode 100644
index 000000000..57929e459
--- /dev/null
+++ b/include/dt-bindings/power/r8a779a0-sysc.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 Renesas Electronics Corp.
+ */
+#ifndef __DT_BINDINGS_POWER_R8A779A0_SYSC_H__
+#define __DT_BINDINGS_POWER_R8A779A0_SYSC_H__
+
+/*
+ * These power domain indices match the Power Domain Register Numbers (PDR)
+ */
+
+#define R8A779A0_PD_A1E0D0C0		0
+#define R8A779A0_PD_A1E0D0C1		1
+#define R8A779A0_PD_A1E0D1C0		2
+#define R8A779A0_PD_A1E0D1C1		3
+#define R8A779A0_PD_A1E1D0C0		4
+#define R8A779A0_PD_A1E1D0C1		5
+#define R8A779A0_PD_A1E1D1C0		6
+#define R8A779A0_PD_A1E1D1C1		7
+#define R8A779A0_PD_A2E0D0		16
+#define R8A779A0_PD_A2E0D1		17
+#define R8A779A0_PD_A2E1D0		18
+#define R8A779A0_PD_A2E1D1		19
+#define R8A779A0_PD_A3E0		20
+#define R8A779A0_PD_A3E1		21
+#define R8A779A0_PD_3DG_A		24
+#define R8A779A0_PD_3DG_B		25
+#define R8A779A0_PD_A1CNN2		32
+#define R8A779A0_PD_A1DSP0		33
+#define R8A779A0_PD_A2IMP01		34
+#define R8A779A0_PD_A2DP0		35
+#define R8A779A0_PD_A2CV0		36
+#define R8A779A0_PD_A2CV1		37
+#define R8A779A0_PD_A2CV4		38
+#define R8A779A0_PD_A2CV6		39
+#define R8A779A0_PD_A2CN2		40
+#define R8A779A0_PD_A1CNN0		41
+#define R8A779A0_PD_A2CN0		42
+#define R8A779A0_PD_A3IR		43
+#define R8A779A0_PD_A1CNN1		44
+#define R8A779A0_PD_A1DSP1		45
+#define R8A779A0_PD_A2IMP23		46
+#define R8A779A0_PD_A2DP1		47
+#define R8A779A0_PD_A2CV2		48
+#define R8A779A0_PD_A2CV3		49
+#define R8A779A0_PD_A2CV5		50
+#define R8A779A0_PD_A2CV7		51
+#define R8A779A0_PD_A2CN1		52
+#define R8A779A0_PD_A3VIP0		56
+#define R8A779A0_PD_A3VIP1		57
+#define R8A779A0_PD_A3VIP2		58
+#define R8A779A0_PD_A3VIP3		59
+#define R8A779A0_PD_A3ISP01		60
+#define R8A779A0_PD_A3ISP23		61
+
+/* Always-on power area */
+#define R8A779A0_PD_ALWAYS_ON		64
+
+#endif /* __DT_BINDINGS_POWER_R8A779A0_SYSC_H__ */