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RTL_GIGA_MAC_VER_EXTENDED implicitly follows RTL_GIGA_MAC_VER_LAST = RTL_GIGA_MAC_NONE - 1, so it has the same value as RTL_GIGA_MAC_NONE. rtl_init_one() therefore sends unknown chips through extended detection. If TX_CONFIG_V2 reads as zero, they are misidentified as RTL9151AS instead of being rejected. Give RTL_GIGA_MAC_VER_EXTENDED a distinct value. It is only a detection marker and is never stored in tp->mac_version. Found by Clang's -Wduplicate-enum and verified with a QEMU stub. Cc: stable+noautosel@kernel.org # untested fix to unlikely driver error path Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com> Link: https://patch.msgid.link/20260808101941.57666-1-kmehltretter@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>