[PATCH] ratelimit: restrict the delay time to a non-negative value

[wangliangzz]

From: Wang Liang <wangliangzz@inspur.com>

The delay time should never be a negative value.

Signed-off-by: Wang Liang <wangliangzz@inspur.com>
---
 include/qemu/ratelimit.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/qemu/ratelimit.h b/include/qemu/ratelimit.h
index 48bf59e857..c8ea855fc1 100644
--- a/include/qemu/ratelimit.h
+++ b/include/qemu/ratelimit.h
@@ -69,7 +69,7 @@ static inline int64_t ratelimit_calculate_delay(RateLimit 
*limit, uint64_t n)
     delay_slices = (double)limit->dispatched / limit->slice_quota;
     limit->slice_end_time = limit->slice_start_time +
         (uint64_t)(delay_slices * limit->slice_ns);
-    return limit->slice_end_time - now;
+    return MAX(limit->slice_end_time - now, 0);
 }
 
 static inline void ratelimit_init(RateLimit *limit)
-- 
2.31.1