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, 60 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/r8a7779-clock.h b/include/dt-bindings/clock/r8a7779-clock.h
new file mode 100644
index 000000000..e39acdc64
--- /dev/null
+++ b/include/dt-bindings/clock/r8a7779-clock.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2013  Horms Solutions Ltd.
+ *
+ * Contact: Simon Horman <horms@verge.net.au>
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_R8A7779_H__
+#define __DT_BINDINGS_CLOCK_R8A7779_H__
+
+/* CPG */
+#define R8A7779_CLK_PLLA	0
+#define R8A7779_CLK_Z		1
+#define R8A7779_CLK_ZS		2
+#define R8A7779_CLK_S		3
+#define R8A7779_CLK_S1		4
+#define R8A7779_CLK_P		5
+#define R8A7779_CLK_B		6
+#define R8A7779_CLK_OUT		7
+
+/* MSTP 0 */
+#define R8A7779_CLK_PWM		5
+#define R8A7779_CLK_HSPI	7
+#define R8A7779_CLK_TMU2	14
+#define R8A7779_CLK_TMU1	15
+#define R8A7779_CLK_TMU0	16
+#define R8A7779_CLK_HSCIF1	18
+#define R8A7779_CLK_HSCIF0	19
+#define R8A7779_CLK_SCIF5	21
+#define R8A7779_CLK_SCIF4	22
+#define R8A7779_CLK_SCIF3	23
+#define R8A7779_CLK_SCIF2	24
+#define R8A7779_CLK_SCIF1	25
+#define R8A7779_CLK_SCIF0	26
+#define R8A7779_CLK_I2C3	27
+#define R8A7779_CLK_I2C2	28
+#define R8A7779_CLK_I2C1	29
+#define R8A7779_CLK_I2C0	30
+
+/* MSTP 1 */
+#define R8A7779_CLK_USB01	0
+#define R8A7779_CLK_USB2	1
+#define R8A7779_CLK_DU		3
+#define R8A7779_CLK_VIN2	8
+#define R8A7779_CLK_VIN1	9
+#define R8A7779_CLK_VIN0	10
+#define R8A7779_CLK_ETHER	14
+#define R8A7779_CLK_SATA	15
+#define R8A7779_CLK_PCIE	16
+#define R8A7779_CLK_VIN3	20
+
+/* MSTP 3 */
+#define R8A7779_CLK_SDHI3	20
+#define R8A7779_CLK_SDHI2	21
+#define R8A7779_CLK_SDHI1	22
+#define R8A7779_CLK_SDHI0	23
+#define R8A7779_CLK_MMC1	30
+#define R8A7779_CLK_MMC0	31
+
+#endif /* __DT_BINDINGS_CLOCK_R8A7779_H__ */