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, 40 insertions, 0 deletions

diff --git a/include/media/i2c/tw9910.h b/include/media/i2c/tw9910.h
new file mode 100644
index 000000000..77da94f90
--- /dev/null
+++ b/include/media/i2c/tw9910.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * tw9910 Driver header
+ *
+ * Copyright (C) 2008 Renesas Solutions Corp.
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * Based on ov772x.h
+ *
+ * Copyright (C) Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ */
+
+#ifndef __TW9910_H__
+#define __TW9910_H__
+
+/* MPOUT (multi-purpose output) pin functions */
+enum tw9910_mpout_pin {
+	TW9910_MPO_VLOSS,
+	TW9910_MPO_HLOCK,
+	TW9910_MPO_SLOCK,
+	TW9910_MPO_VLOCK,
+	TW9910_MPO_MONO,
+	TW9910_MPO_DET50,
+	TW9910_MPO_FIELD,
+	TW9910_MPO_RTCO,
+};
+
+/**
+ * struct tw9910_video_info - tw9910 driver interface structure
+ * @buswidth:		Parallel data bus width (8 or 16).
+ * @mpout:		Selected function of MPOUT (multi-purpose output) pin.
+ *			See enum tw9910_mpout_pin
+ */
+struct tw9910_video_info {
+	unsigned long		buswidth;
+	enum tw9910_mpout_pin	mpout;
+};
+
+
+#endif /* __TW9910_H__ */