From 2d6e4ff11a208c14fad28fc699426b0a2f8be8f9 Mon Sep 17 00:00:00 2001
From: Bob Halley <halley@dnspython.org>
Date: Fri, 17 Dec 2021 08:19:46 -0800
Subject: Do not set asyncio future if it is already done.  [#740]

---
 dns/_asyncio_backend.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dns/_asyncio_backend.py b/dns/_asyncio_backend.py
index 4c8c054..d737d13 100644
--- a/dns/_asyncio_backend.py
+++ b/dns/_asyncio_backend.py
@@ -28,7 +28,7 @@ class _DatagramProtocol:
         self.transport = transport
 
     def datagram_received(self, data, addr):
-        if self.recvfrom:
+        if self.recvfrom and not self.recvfrom.done():
             self.recvfrom.set_result((data, addr))
             self.recvfrom = None
 
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