From 00b2567fbf6b264a77dbe63ca2424939957f3128 Mon Sep 17 00:00:00 2001
From: Dario Nieuwenhuis <dirbaio@dirbaio.net>
Date: Mon, 30 Jun 2025 00:19:47 +0200
Subject: [PATCH] stm32/dma: add missing fence on BDMA start.

---
 embassy-stm32/src/dma/dma_bdma.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/embassy-stm32/src/dma/dma_bdma.rs b/embassy-stm32/src/dma/dma_bdma.rs
index 7dbbe7b72..caf135989 100644
--- a/embassy-stm32/src/dma/dma_bdma.rs
+++ b/embassy-stm32/src/dma/dma_bdma.rs
@@ -344,6 +344,9 @@ impl AnyChannel {
         peripheral_size: WordSize,
         options: TransferOptions,
     ) {
+        // "Preceding reads and writes cannot be moved past subsequent writes."
+        fence(Ordering::SeqCst);
+
         let info = self.info();
         #[cfg(feature = "_dual-core")]
         {
@@ -362,9 +365,6 @@ impl AnyChannel {
                 let state: &ChannelState = &STATE[self.id as usize];
                 let ch = r.st(info.num);
 
-                // "Preceding reads and writes cannot be moved past subsequent writes."
-                fence(Ordering::SeqCst);
-
                 state.complete_count.store(0, Ordering::Release);
                 self.clear_irqs();