From 22fe5da13e116e35fcade7f8335d7d5d6c9ef612 Mon Sep 17 00:00:00 2001
From: JinYan Su <751080330@qq.com>
Date: Fri, 12 Dec 2025 13:16:47 +0800
Subject: [PATCH] Fix negative duration panic in token bucket wait time
 calculation (#14941)

Signed-off-by: xiaguan <751080330@qq.com>
---
 sgl-model-gateway/src/core/token_bucket.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sgl-model-gateway/src/core/token_bucket.rs b/sgl-model-gateway/src/core/token_bucket.rs
index a2bddeb6f..d3efa120e 100644
--- a/sgl-model-gateway/src/core/token_bucket.rs
+++ b/sgl-model-gateway/src/core/token_bucket.rs
@@ -105,7 +105,7 @@ impl TokenBucket {
         let wait_time = {
             let inner = self.inner.lock().await;
             let tokens_needed = tokens - inner.tokens;
-            let wait_secs = tokens_needed / self.refill_rate;
+            let wait_secs = (tokens_needed / self.refill_rate).max(0.0);
             Duration::from_secs_f64(wait_secs)
         };