From f3ed0c60265c84ddcc11e4dea980bdc0b8343985 Mon Sep 17 00:00:00 2001
From: Oliver Rockstedt <info@sourcebox.de>
Date: Sun, 6 Oct 2024 17:39:47 +0200
Subject: [PATCH] embassy-sync: fix len calculation for zerocopy_channel

---
 embassy-sync/src/zerocopy_channel.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/embassy-sync/src/zerocopy_channel.rs b/embassy-sync/src/zerocopy_channel.rs
index a2c763294..a669cbd09 100644
--- a/embassy-sync/src/zerocopy_channel.rs
+++ b/embassy-sync/src/zerocopy_channel.rs
@@ -290,7 +290,15 @@ impl State {
     }
 
     fn len(&self) -> usize {
-        self.len
+        if !self.full {
+            if self.back >= self.front {
+                self.back - self.front
+            } else {
+                self.len + self.back - self.front
+            }
+        } else {
+            self.len
+        }
     }
 
     fn is_full(&self) -> bool {