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, 57 insertions, 0 deletions

diff --git a/fs/nls/Makefile b/fs/nls/Makefile
new file mode 100644
index 000000000..5062c699d
--- /dev/null
+++ b/fs/nls/Makefile
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for native language support
+#
+
+obj-$(CONFIG_NLS)		+= nls_base.o
+
+obj-$(CONFIG_NLS_CODEPAGE_437)	+= nls_cp437.o
+obj-$(CONFIG_NLS_CODEPAGE_737)	+= nls_cp737.o
+obj-$(CONFIG_NLS_CODEPAGE_775)	+= nls_cp775.o
+obj-$(CONFIG_NLS_CODEPAGE_850)	+= nls_cp850.o
+obj-$(CONFIG_NLS_CODEPAGE_852)	+= nls_cp852.o
+obj-$(CONFIG_NLS_CODEPAGE_855)	+= nls_cp855.o
+obj-$(CONFIG_NLS_CODEPAGE_857)	+= nls_cp857.o
+obj-$(CONFIG_NLS_CODEPAGE_860)	+= nls_cp860.o
+obj-$(CONFIG_NLS_CODEPAGE_861)	+= nls_cp861.o
+obj-$(CONFIG_NLS_CODEPAGE_862)	+= nls_cp862.o
+obj-$(CONFIG_NLS_CODEPAGE_863)	+= nls_cp863.o
+obj-$(CONFIG_NLS_CODEPAGE_864)	+= nls_cp864.o
+obj-$(CONFIG_NLS_CODEPAGE_865)	+= nls_cp865.o
+obj-$(CONFIG_NLS_CODEPAGE_866)	+= nls_cp866.o
+obj-$(CONFIG_NLS_CODEPAGE_869)	+= nls_cp869.o
+obj-$(CONFIG_NLS_CODEPAGE_874)	+= nls_cp874.o
+obj-$(CONFIG_NLS_CODEPAGE_932)	+= nls_cp932.o nls_euc-jp.o
+obj-$(CONFIG_NLS_CODEPAGE_936)	+= nls_cp936.o
+obj-$(CONFIG_NLS_CODEPAGE_949)	+= nls_cp949.o
+obj-$(CONFIG_NLS_CODEPAGE_950)	+= nls_cp950.o
+obj-$(CONFIG_NLS_CODEPAGE_1250) += nls_cp1250.o
+obj-$(CONFIG_NLS_CODEPAGE_1251)	+= nls_cp1251.o
+obj-$(CONFIG_NLS_ASCII)		+= nls_ascii.o
+obj-$(CONFIG_NLS_ISO8859_1)	+= nls_iso8859-1.o
+obj-$(CONFIG_NLS_ISO8859_2)	+= nls_iso8859-2.o
+obj-$(CONFIG_NLS_ISO8859_3)	+= nls_iso8859-3.o
+obj-$(CONFIG_NLS_ISO8859_4)	+= nls_iso8859-4.o
+obj-$(CONFIG_NLS_ISO8859_5)	+= nls_iso8859-5.o
+obj-$(CONFIG_NLS_ISO8859_6)	+= nls_iso8859-6.o
+obj-$(CONFIG_NLS_ISO8859_7)	+= nls_iso8859-7.o
+obj-$(CONFIG_NLS_ISO8859_8)	+= nls_cp1255.o
+obj-$(CONFIG_NLS_ISO8859_9)	+= nls_iso8859-9.o
+obj-$(CONFIG_NLS_ISO8859_13)	+= nls_iso8859-13.o
+obj-$(CONFIG_NLS_ISO8859_14)	+= nls_iso8859-14.o
+obj-$(CONFIG_NLS_ISO8859_15)	+= nls_iso8859-15.o
+obj-$(CONFIG_NLS_KOI8_R)	+= nls_koi8-r.o
+obj-$(CONFIG_NLS_KOI8_U)	+= nls_koi8-u.o nls_koi8-ru.o
+obj-$(CONFIG_NLS_UTF8)		+= nls_utf8.o
+obj-$(CONFIG_NLS_MAC_CELTIC)    += mac-celtic.o
+obj-$(CONFIG_NLS_MAC_CENTEURO)  += mac-centeuro.o
+obj-$(CONFIG_NLS_MAC_CROATIAN)  += mac-croatian.o
+obj-$(CONFIG_NLS_MAC_CYRILLIC)  += mac-cyrillic.o
+obj-$(CONFIG_NLS_MAC_GAELIC)    += mac-gaelic.o
+obj-$(CONFIG_NLS_MAC_GREEK)     += mac-greek.o
+obj-$(CONFIG_NLS_MAC_ICELAND)   += mac-iceland.o
+obj-$(CONFIG_NLS_MAC_INUIT)     += mac-inuit.o
+obj-$(CONFIG_NLS_MAC_ROMANIAN)  += mac-romanian.o
+obj-$(CONFIG_NLS_MAC_ROMAN)     += mac-roman.o
+obj-$(CONFIG_NLS_MAC_TURKISH)   += mac-turkish.o
+obj-$(CONFIG_NLS_UCS2_UTILS)		+= nls_ucs2_utils.o