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, 54 insertions, 0 deletions

diff --git a/fs/ntfs/ntfs_codec.h b/fs/ntfs/ntfs_codec.h
new file mode 100644
index 000000000..6030055fb
--- /dev/null
+++ b/fs/ntfs/ntfs_codec.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Transparent compression codec interface.
+ *
+ * Copyright (c) 2026 LG Electronics Co., Ltd.
+ */
+
+#ifndef _NTFS_CODEC_H
+#define _NTFS_CODEC_H
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+
+struct compress_context;
+
+enum ntfs_codec_id {
+	NTFS_CODEC_LZNT1,
+#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION
+	NTFS_CODEC_XPRESS4K,
+	NTFS_CODEC_XPRESS8K,
+	NTFS_CODEC_XPRESS16K,
+	NTFS_CODEC_LZX32K,
+#endif
+};
+
+struct ntfs_codec_ops {
+	enum ntfs_codec_id id;
+	const char *name;
+	size_t (*scratch_size)(u32 chunk_size);
+	int (*decompress_chunk)(void *scratch,
+				const void *src, size_t src_len,
+				void *dst, size_t dst_len,
+				u32 chunk_size);
+	int (*decompress_pages)(struct page *dest_pages[],
+				int completed_pages[],
+				int *dest_index, int *dest_ofs,
+				int dest_max_index, int dest_max_ofs,
+				int xpage, char *xpage_done,
+				u8 *cb_start, u32 cb_size,
+				loff_t i_size, s64 initialized_size);
+	int (*compress_subblock)(struct compress_context *pctx,
+				 const char *inbuf, int bufsize, char *outbuf);
+};
+
+extern const struct ntfs_codec_ops ntfs_lznt1_codec_ops;
+#ifdef CONFIG_NTFS_FS_WOF_COMPRESSION
+extern const struct ntfs_codec_ops ntfs_xpress4k_codec_ops;
+extern const struct ntfs_codec_ops ntfs_xpress8k_codec_ops;
+extern const struct ntfs_codec_ops ntfs_xpress16k_codec_ops;
+extern const struct ntfs_codec_ops ntfs_lzx32k_codec_ops;
+#endif
+
+#endif /* _NTFS_CODEC_H */