From 82c795d6f28ee365bfa822f30612e5da35c93fc0 Mon Sep 17 00:00:00 2001
From: Huamin Li <3ericli@gmail.com>
Date: Sat, 29 Nov 2025 22:04:55 -0800
Subject: [PATCH] Fix AttributeError about _use_fi_prefill (#29734)

Signed-off-by: Huamin Li <3ericli@gmail.com>
---
 vllm/v1/attention/backends/mla/common.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vllm/v1/attention/backends/mla/common.py b/vllm/v1/attention/backends/mla/common.py
index b09541dbf7919..180625b6ce897 100755
--- a/vllm/v1/attention/backends/mla/common.py
+++ b/vllm/v1/attention/backends/mla/common.py
@@ -2061,7 +2061,7 @@ class MLACommonImpl(MLACommonBaseImpl[M], Generic[M]):
                     attn_out,
                     lse,
                     get_dcp_group(),
-                    is_lse_base_on_e=not self._use_fi_prefill,
+                    is_lse_base_on_e=not getattr(self, "_use_fi_prefill", False),
                 )
 
             # v_up projection