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, 51 insertions, 0 deletions

diff --git a/fs/jfs/Kconfig b/fs/jfs/Kconfig
new file mode 100644
index 000000000..3728cf4d9
--- /dev/null
+++ b/fs/jfs/Kconfig
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config JFS_FS
+	tristate "JFS filesystem support"
+	select BUFFER_HEAD
+	select NLS
+	select NLS_UCS2_UTILS
+	select CRC32
+	select LEGACY_DIRECT_IO
+	help
+	  This is a port of IBM's Journaled Filesystem .  More information is
+	  available in the file <file:Documentation/admin-guide/jfs.rst>.
+
+	  If you do not intend to use the JFS filesystem, say N.
+
+config JFS_POSIX_ACL
+	bool "JFS POSIX Access Control Lists"
+	depends on JFS_FS
+	select FS_POSIX_ACL
+	help
+	  Posix Access Control Lists (ACLs) support permissions for users and
+	  groups beyond the owner/group/world scheme.
+
+	  If you don't know what Access Control Lists are, say N
+
+config JFS_SECURITY
+	bool "JFS Security Labels"
+	depends on JFS_FS
+	help
+	  Security labels support alternative access control models
+	  implemented by security modules like SELinux.  This option
+	  enables an extended attribute handler for file security
+	  labels in the jfs filesystem.
+
+	  If you are not using a security module that requires using
+	  extended attributes for file security labels, say N.
+
+config JFS_DEBUG
+	bool "JFS debugging"
+	depends on JFS_FS
+	help
+	  If you are experiencing any problems with the JFS filesystem, say
+	  Y here.  This will result in additional debugging messages to be
+	  written to the system log.  Under normal circumstances, this
+	  results in very little overhead.
+
+config JFS_STATISTICS
+	bool "JFS statistics"
+	depends on JFS_FS
+	help
+	  Enabling this option will cause statistics from the JFS file system
+	  to be made available to the user in the /proc/fs/jfs/ directory.