From e53bbfd0038b16b706e91fffa543a7cad0828659 Mon Sep 17 00:00:00 2001
From: stephematician <stephematician@gmail.com>
Date: Tue, 22 Oct 2024 16:12:16 +1100
Subject: [PATCH] fix possible reqbuf fail when memory mapped

explicitly close the mmap buffers before invoke VIDIOC_REQBUF
---
 linuxpy/video/device.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/linuxpy/video/device.py b/linuxpy/video/device.py
index 4399342..963cb85 100644
--- a/linuxpy/video/device.py
+++ b/linuxpy/video/device.py
@@ -1847,8 +1847,10 @@ def prepare_buffers(self):
 
     def release_buffers(self):
         self.device.log.info("Freeing buffers...")
-        self.buffer_manager.free_buffers(self.source)
+        for buf in self.buffers:
+            buf.close()
         self.buffers = None
+        self.buffer_manager.free_buffers(self.source)
         self.format = None
         self.device.log.info("Buffers freed")