From 9792a62e7f30e707a3cbe976aa9a82d1a72de68b Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 20 Jan 2020 12:07:09 +0100 Subject: [PATCH] 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: Felix Fietkau --- dma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/dma.c b/dma.c index 35cc75c3..a7510e42 100644 --- a/dma.c +++ b/dma.c @@ -238,7 +238,9 @@ 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;