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, 47 insertions, 0 deletions

diff --git a/net/ceph/Kconfig b/net/ceph/Kconfig
new file mode 100644
index 000000000..7e2528cde
--- /dev/null
+++ b/net/ceph/Kconfig
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config CEPH_LIB
+	tristate "Ceph core library"
+	depends on INET
+	select CRC32
+	select CRYPTO_AES
+	select CRYPTO_CBC
+	select CRYPTO_GCM
+	select CRYPTO_KRB5
+	select CRYPTO_LIB_SHA256
+	select CRYPTO
+	select KEYS
+	default n
+	help
+	  Choose Y or M here to include cephlib, which provides the
+	  common functionality to both the Ceph filesystem and
+	  to the rados block device (rbd).
+
+	  More information at https://ceph.io/.
+
+	  If unsure, say N.
+
+config CEPH_LIB_PRETTYDEBUG
+	bool "Include file:line in ceph debug output"
+	depends on CEPH_LIB
+	default n
+	help
+	  If you say Y here, debug output will include a filename and
+	  line to aid debugging.  This increases kernel size and slows
+	  execution slightly when debug call sites are enabled (e.g.,
+	  via CONFIG_DYNAMIC_DEBUG).
+
+	  If unsure, say N.
+
+config CEPH_LIB_USE_DNS_RESOLVER
+	bool "Use in-kernel support for DNS lookup"
+	depends on CEPH_LIB
+	select DNS_RESOLVER
+	default n
+	help
+	  If you say Y here, hostnames (e.g. monitor addresses) will
+	  be resolved using the CONFIG_DNS_RESOLVER facility.
+
+	  For information on how to use CONFIG_DNS_RESOLVER consult
+	  Documentation/networking/dns_resolver.rst
+
+	  If unsure, say N.