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, 63 insertions, 0 deletions

diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
new file mode 100644
index 000000000..c0a421fe0
--- /dev/null
+++ b/include/net/transp_v6.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TRANSP_V6_H
+#define _TRANSP_V6_H
+
+#include <net/checksum.h>
+#include <net/sock.h>
+
+/* IPv6 transport protocols */
+extern struct proto rawv6_prot;
+extern struct proto udpv6_prot;
+extern struct proto tcpv6_prot;
+extern struct proto pingv6_prot;
+
+struct flowi6;
+struct ipcm6_cookie;
+
+/* extension headers */
+int ipv6_exthdrs_init(void);
+void ipv6_exthdrs_exit(void);
+int ipv6_frag_init(void);
+void ipv6_frag_exit(void);
+
+/* transport protocols */
+int pingv6_init(void);
+void pingv6_exit(void);
+int rawv6_init(void);
+void rawv6_exit(void);
+int udpv6_init(void);
+void udpv6_exit(void);
+int tcpv6_init(void);
+void tcpv6_exit(void);
+
+/* this does all the common and the specific ctl work */
+void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
+			   struct sk_buff *skb);
+void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
+				  struct sk_buff *skb);
+void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
+				    struct sk_buff *skb);
+
+int ip6_datagram_send_ctl(struct net *net, struct sock *sk, struct msghdr *msg,
+			  struct flowi6 *fl6, struct ipcm6_cookie *ipc6);
+
+void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
+			       __u16 srcp, __u16 destp, int rqueue, int bucket);
+static inline void
+ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, __u16 srcp,
+			__u16 destp, int bucket)
+{
+	__ip6_dgram_sock_seq_show(seq, sp, srcp, destp, sk_rmem_alloc_get(sp),
+				  bucket);
+}
+
+#define LOOPBACK4_IPV6 cpu_to_be32(0x7f000006)
+
+#define IPV6_SEQ_DGRAM_HEADER					       \
+	"  sl  "						       \
+	"local_address                         "		       \
+	"remote_address                        "		       \
+	"st tx_queue rx_queue tr tm->when retrnsmt"		       \
+	"   uid  timeout inode ref pointer drops\n"
+
+#endif