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, 72 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/imxrt1050-clock.h b/include/dt-bindings/clock/imxrt1050-clock.h
new file mode 100644
index 000000000..93bef0832
--- /dev/null
+++ b/include/dt-bindings/clock/imxrt1050-clock.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright(C) 2019
+ * Author(s): Giulio Benetti <giulio.benetti@benettiengineering.com>
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_IMXRT1050_H
+#define __DT_BINDINGS_CLOCK_IMXRT1050_H
+
+#define IMXRT1050_CLK_DUMMY			0
+#define IMXRT1050_CLK_CKIL			1
+#define IMXRT1050_CLK_CKIH			2
+#define IMXRT1050_CLK_OSC			3
+#define IMXRT1050_CLK_PLL2_PFD0_352M		4
+#define IMXRT1050_CLK_PLL2_PFD1_594M		5
+#define IMXRT1050_CLK_PLL2_PFD2_396M		6
+#define IMXRT1050_CLK_PLL3_PFD0_720M		7
+#define IMXRT1050_CLK_PLL3_PFD1_664_62M		8
+#define IMXRT1050_CLK_PLL3_PFD2_508_24M		9
+#define IMXRT1050_CLK_PLL3_PFD3_454_74M		10
+#define IMXRT1050_CLK_PLL2_198M			11
+#define IMXRT1050_CLK_PLL3_120M			12
+#define IMXRT1050_CLK_PLL3_80M			13
+#define IMXRT1050_CLK_PLL3_60M			14
+#define IMXRT1050_CLK_PLL1_BYPASS		15
+#define IMXRT1050_CLK_PLL2_BYPASS		16
+#define IMXRT1050_CLK_PLL3_BYPASS		17
+#define IMXRT1050_CLK_PLL5_BYPASS		19
+#define IMXRT1050_CLK_PLL1_REF_SEL		20
+#define IMXRT1050_CLK_PLL2_REF_SEL		21
+#define IMXRT1050_CLK_PLL3_REF_SEL		22
+#define IMXRT1050_CLK_PLL5_REF_SEL		23
+#define IMXRT1050_CLK_PRE_PERIPH_SEL		24
+#define IMXRT1050_CLK_PERIPH_SEL		25
+#define IMXRT1050_CLK_SEMC_ALT_SEL		26
+#define IMXRT1050_CLK_SEMC_SEL			27
+#define IMXRT1050_CLK_USDHC1_SEL		28
+#define IMXRT1050_CLK_USDHC2_SEL		29
+#define IMXRT1050_CLK_LPUART_SEL		30
+#define IMXRT1050_CLK_LCDIF_SEL			31
+#define IMXRT1050_CLK_VIDEO_POST_DIV_SEL	32
+#define IMXRT1050_CLK_VIDEO_DIV			33
+#define IMXRT1050_CLK_ARM_PODF			34
+#define IMXRT1050_CLK_LPUART_PODF		35
+#define IMXRT1050_CLK_USDHC1_PODF		36
+#define IMXRT1050_CLK_USDHC2_PODF		37
+#define IMXRT1050_CLK_SEMC_PODF			38
+#define IMXRT1050_CLK_AHB_PODF			39
+#define IMXRT1050_CLK_LCDIF_PRED		40
+#define IMXRT1050_CLK_LCDIF_PODF		41
+#define IMXRT1050_CLK_USDHC1			42
+#define IMXRT1050_CLK_USDHC2			43
+#define IMXRT1050_CLK_LPUART1			44
+#define IMXRT1050_CLK_SEMC			45
+#define IMXRT1050_CLK_LCDIF_APB			46
+#define IMXRT1050_CLK_PLL1_ARM			47
+#define IMXRT1050_CLK_PLL2_SYS			48
+#define IMXRT1050_CLK_PLL3_USB_OTG		49
+#define IMXRT1050_CLK_PLL4_AUDIO		50
+#define IMXRT1050_CLK_PLL5_VIDEO		51
+#define IMXRT1050_CLK_PLL6_ENET			52
+#define IMXRT1050_CLK_PLL7_USB_HOST		53
+#define IMXRT1050_CLK_LCDIF_PIX			54
+#define IMXRT1050_CLK_USBOH3			55
+#define IMXRT1050_CLK_IPG_PDOF			56
+#define IMXRT1050_CLK_PER_CLK_SEL		57
+#define IMXRT1050_CLK_PER_PDOF			58
+#define IMXRT1050_CLK_DMA			59
+#define IMXRT1050_CLK_DMA_MUX			60
+#define IMXRT1050_CLK_END			61
+
+#endif /* __DT_BINDINGS_CLOCK_IMXRT1050_H */