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fix: load/store ordering

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elagil 2025-08-25 21:10:59 +02:00 committed by Dario Nieuwenhuis
parent bfd82ff82c
commit 50224583db
2 changed files with 6 additions and 6 deletions
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6
embassy-stm32/src/dma/gpdma/mod.rs
View File

@ -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 {

6
embassy-stm32/src/dma/gpdma/ringbuffered.rs
View File

@ -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 {