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, 63 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/stm32fx-clock.h b/include/dt-bindings/clock/stm32fx-clock.h
new file mode 100644
index 000000000..b6ff9c68c
--- /dev/null
+++ b/include/dt-bindings/clock/stm32fx-clock.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * stm32fx-clock.h
+ *
+ * Copyright (C) 2016 STMicroelectronics
+ * Author: Gabriel Fernandez for STMicroelectronics.
+ */
+
+/*
+ * List of clocks which are not derived from system clock (SYSCLOCK)
+ *
+ * The index of these clocks is the secondary index of DT bindings
+ * (see Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml)
+ *
+ * e.g:
+	<assigned-clocks = <&rcc 1 CLK_LSE>;
+*/
+
+#ifndef _DT_BINDINGS_CLK_STMFX_H
+#define _DT_BINDINGS_CLK_STMFX_H
+
+#define SYSTICK			0
+#define FCLK			1
+#define CLK_LSI			2
+#define CLK_LSE			3
+#define CLK_HSE_RTC		4
+#define CLK_RTC			5
+#define PLL_VCO_I2S		6
+#define PLL_VCO_SAI		7
+#define CLK_LCD			8
+#define CLK_I2S			9
+#define CLK_SAI1		10
+#define CLK_SAI2		11
+#define CLK_I2SQ_PDIV		12
+#define CLK_SAIQ_PDIV		13
+#define CLK_HSI			14
+#define CLK_SYSCLK		15
+#define CLK_F469_DSI		16
+
+#define END_PRIMARY_CLK		17
+
+#define CLK_HDMI_CEC		16
+#define CLK_SPDIF		17
+#define CLK_USART1		18
+#define CLK_USART2		19
+#define CLK_USART3		20
+#define CLK_UART4		21
+#define CLK_UART5		22
+#define CLK_USART6		23
+#define CLK_UART7		24
+#define CLK_UART8		25
+#define CLK_I2C1		26
+#define CLK_I2C2		27
+#define CLK_I2C3		28
+#define CLK_I2C4		29
+#define CLK_LPTIMER		30
+#define CLK_PLL_SRC		31
+#define CLK_DFSDM1		32
+#define CLK_ADFSDM1		33
+#define CLK_F769_DSI		34
+#define END_PRIMARY_CLK_F7	35
+
+#endif