Commit 5ffc6b5a authored by Felix Fietkau's avatar Felix Fietkau
Browse files

mt76: set dma-done flag for flushed descriptors 



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

Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
parent 94d4d076

drivers/net/wireless/mediatek/mt76/dma.c

+3 −1
Original line number Diff line number Diff line
@@ -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;

CRA Git | Maintained and supported by SUSTech CRA and CCSE