From fe86e485f4ea415dc40a61b2520f6d20a7580468 Mon Sep 17 00:00:00 2001
From: Shin'ichiro Kawasaki <kawasaki@juno.dti.ne.jp>
Date: Sat, 25 Jul 2020 10:24:48 +0900
Subject: [PATCH] BLESession.close: Improve close handler

Guard peripheral disconnect handling with lock not to race with other
peripheral operations. After disconnect, set None to the peripheral
reference to ensure no use.
---
 scratch_link.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scratch_link.py b/scratch_link.py
index ad2bc1a..7ab4e7f 100755
--- a/scratch_link.py
+++ b/scratch_link.py
@@ -433,7 +433,9 @@ class BLESession(Session):
         self.status = self.DONE
         if self.perip:
             logger.info(f"disconnect to BLE peripheral: {self.perip}")
-            self.perip.disconnect()
+            with self.lock:
+                self.perip.disconnect()
+            self.perip = None
 
     def __del__(self):
         self.close()