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, 58 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/lpc32xx-clock.h b/include/dt-bindings/clock/lpc32xx-clock.h
new file mode 100644
index 000000000..e624d3a52
--- /dev/null
+++ b/include/dt-bindings/clock/lpc32xx-clock.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2015 Vladimir Zapolskiy <vz@mleia.com>
+ *
+ * This code is released using a dual license strategy: BSD/GPL
+ * You can choose the licence that better fits your requirements.
+ *
+ * Released under the terms of 3-clause BSD License
+ * Released under the terms of GNU General Public License Version 2.0
+ *
+ */
+
+#ifndef __DT_BINDINGS_LPC32XX_CLOCK_H
+#define __DT_BINDINGS_LPC32XX_CLOCK_H
+
+/* LPC32XX System Control Block clocks */
+#define LPC32XX_CLK_RTC		1
+#define LPC32XX_CLK_DMA		2
+#define LPC32XX_CLK_MLC		3
+#define LPC32XX_CLK_SLC		4
+#define LPC32XX_CLK_LCD		5
+#define LPC32XX_CLK_MAC		6
+#define LPC32XX_CLK_SD		7
+#define LPC32XX_CLK_DDRAM	8
+#define LPC32XX_CLK_SSP0	9
+#define LPC32XX_CLK_SSP1	10
+#define LPC32XX_CLK_UART3	11
+#define LPC32XX_CLK_UART4	12
+#define LPC32XX_CLK_UART5	13
+#define LPC32XX_CLK_UART6	14
+#define LPC32XX_CLK_IRDA	15
+#define LPC32XX_CLK_I2C1	16
+#define LPC32XX_CLK_I2C2	17
+#define LPC32XX_CLK_TIMER0	18
+#define LPC32XX_CLK_TIMER1	19
+#define LPC32XX_CLK_TIMER2	20
+#define LPC32XX_CLK_TIMER3	21
+#define LPC32XX_CLK_TIMER4	22
+#define LPC32XX_CLK_TIMER5	23
+#define LPC32XX_CLK_WDOG	24
+#define LPC32XX_CLK_I2S0	25
+#define LPC32XX_CLK_I2S1	26
+#define LPC32XX_CLK_SPI1	27
+#define LPC32XX_CLK_SPI2	28
+#define LPC32XX_CLK_MCPWM	29
+#define LPC32XX_CLK_HSTIMER	30
+#define LPC32XX_CLK_KEY		31
+#define LPC32XX_CLK_PWM1	32
+#define LPC32XX_CLK_PWM2	33
+#define LPC32XX_CLK_ADC		34
+#define LPC32XX_CLK_HCLK_PLL	35
+#define LPC32XX_CLK_PERIPH	36
+
+/* LPC32XX USB clocks */
+#define LPC32XX_USB_CLK_I2C	1
+#define LPC32XX_USB_CLK_DEVICE	2
+#define LPC32XX_USB_CLK_HOST	3
+
+#endif /* __DT_BINDINGS_LPC32XX_CLOCK_H */