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, 31 insertions, 0 deletions

diff --git a/fs/hfsplus/Kconfig b/fs/hfsplus/Kconfig
new file mode 100644
index 000000000..ca8401cb6
--- /dev/null
+++ b/fs/hfsplus/Kconfig
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config HFSPLUS_FS
+	tristate "Apple Extended HFS file system support"
+	depends on BLOCK
+	select BUFFER_HEAD
+	select NLS
+	select NLS_UTF8
+	select LEGACY_DIRECT_IO
+	help
+	  If you say Y here, you will be able to mount extended format
+	  Macintosh-formatted hard drive partitions with full read-write access.
+
+	  This file system is often called HFS+ and was introduced with
+	  MacOS 8. It includes all Mac specific filesystem data such as
+	  data forks and creator codes, but it also has several UNIX
+	  style features such as file ownership and permissions.
+
+config HFSPLUS_KUNIT_TEST
+	tristate "KUnit tests for HFS+ filesystem" if !KUNIT_ALL_TESTS
+	depends on HFSPLUS_FS && KUNIT
+	default KUNIT_ALL_TESTS
+	help
+	  This builds KUnit tests for the HFS+ filesystem.
+
+	  KUnit tests run during boot and output the results to the debug
+	  log in TAP format (https://testanything.org/). Only useful for
+	  kernel devs running KUnit test harness and are not for inclusion
+	  into a production build.
+
+	  For more information on KUnit and unit tests in general please
+	  refer to the KUnit documentation in Documentation/dev-tools/kunit/.