fix: load/store ordering

2 files changed, 6 insertions, 6 deletions

diff --git a/embassy-stm32/src/dma/gpdma/mod.rs b/embassy-stm32/src/dma/gpdma/mod.rs
index e906c7559..a158d30b8 100644
--- a/embassy-stm32/src/dma/gpdma/mod.rs
+++ b/embassy-stm32/src/dma/gpdma/mod.rs
@@ -178,15 +178,15 @@ impl AnyChannel {
         if sr.tcf() {
             ch.fcr().write(|w| w.set_tcf(true));
 
-            let lli_count = state.lli_state.count.load(Ordering::Relaxed);
+            let lli_count = state.lli_state.count.load(Ordering::Acquire);
             let complete = if lli_count > 0 {
-                let next_lli_index = state.lli_state.index.load(Ordering::Relaxed) + 1;
+                let next_lli_index = state.lli_state.index.load(Ordering::Acquire) + 1;
                 let complete = next_lli_index >= lli_count;
 
                 state
                     .lli_state
                     .index
-                    .store(if complete { 0 } else { next_lli_index }, Ordering::Relaxed);
+                    .store(if complete { 0 } else { next_lli_index }, Ordering::Release);
 
                 complete
             } else {
diff --git a/embassy-stm32/src/dma/gpdma/ringbuffered.rs b/embassy-stm32/src/dma/gpdma/ringbuffered.rs
index c49c6c73d..20f46b103 100644
--- a/embassy-stm32/src/dma/gpdma/ringbuffered.rs
+++ b/embassy-stm32/src/dma/gpdma/ringbuffered.rs
@@ -20,11 +20,11 @@ impl<'a> DmaCtrl for DmaCtrlImpl<'a> {
         let state = &STATE[self.0.id as usize];
         let current_remaining = self.0.get_remaining_transfers() as usize;
 
-        let lli_count = state.lli_state.count.load(Ordering::Relaxed);
+        let lli_count = state.lli_state.count.load(Ordering::Acquire);
 
         if lli_count > 0 {
-            let lli_index = state.lli_state.index.load(Ordering::Relaxed);
-            let single_transfer_count = state.lli_state.transfer_count.load(Ordering::Relaxed) / lli_count;
+            let lli_index = state.lli_state.index.load(Ordering::Acquire);
+            let single_transfer_count = state.lli_state.transfer_count.load(Ordering::Acquire) / lli_count;
 
             (lli_count - lli_index - 1) * single_transfer_count + current_remaining
         } else {