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/fs/dlm/config.h b/fs/dlm/config.h
new file mode 100644
index 000000000..4ebd45f75
--- /dev/null
+++ b/fs/dlm/config.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/******************************************************************************
+*******************************************************************************
+**
+**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
+**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
+**
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef __CONFIG_DOT_H__
+#define __CONFIG_DOT_H__
+
+#define DLM_MAX_SOCKET_BUFSIZE	4096
+
+struct dlm_config_node {
+	int nodeid;
+	int weight;
+	bool gone;
+	int new;
+	uint32_t comm_seq;
+	unsigned int release_recover;
+};
+
+extern const struct rhashtable_params dlm_rhash_rsb_params;
+
+#define DLM_MAX_ADDR_COUNT 8
+
+#define DLM_PROTO_TCP	0
+#define DLM_PROTO_SCTP	1
+
+struct dlm_config_info {
+	__be16 ci_tcp_port;
+	unsigned int ci_buffer_size;
+	unsigned int ci_rsbtbl_size;
+	unsigned int ci_recover_timer;
+	unsigned int ci_toss_secs;
+	unsigned int ci_scan_secs;
+	unsigned int ci_log_debug;
+	unsigned int ci_log_info;
+	unsigned int ci_protocol;
+	unsigned int ci_mark;
+	unsigned int ci_new_rsb_count;
+	unsigned int ci_recover_callbacks;
+	char ci_cluster_name[DLM_LOCKSPACE_LEN];
+};
+
+extern struct dlm_config_info dlm_config;
+
+int dlm_config_init(void);
+void dlm_config_exit(void);
+int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
+		     int *count_out);
+int dlm_comm_seq(int nodeid, uint32_t *seq, bool locked);
+int dlm_our_nodeid(void);
+int dlm_our_addr(struct sockaddr_storage *addr, int num);
+
+#endif				/* __CONFIG_DOT_H__ */
+