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mt76: set dma-done flag for flushed descriptors

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Avoids a theoretical corner case where the hardware could try to process
a stale descriptor after a watchdog reset

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau
2020-01-20 12:07:09 +01:00
parent 94d4d07675
commit 5ffc6b5a98
1 changed files with 3 additions and 1 deletions
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4
drivers/net/wireless/mediatek/mt76/dma.c
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@@ -246,7 +246,9 @@ mt76_dma_dequeue(struct mt76_dev *dev, struct mt76_queue *q, bool flush,
if (!q->queued)
return NULL;
if (!flush && !(q->desc[idx].ctrl & cpu_to_le32(MT_DMA_CTL_DMA_DONE)))
if (flush)
q->desc[idx].ctrl |= cpu_to_le32(MT_DMA_CTL_DMA_DONE);
else if (!(q->desc[idx].ctrl & cpu_to_le32(MT_DMA_CTL_DMA_DONE)))
return NULL;
q->tail = (q->tail + 1) % q->ndesc;