From f8b61c27d3139a02884ec7c20eeeccc797eeeb19 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 27 Feb 2016 18:25:24 +0100
Subject: [PATCH] dma: fix tx ring flush

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
 dma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dma.c b/dma.c
index f0dd6024..dff9bd6a 100644
--- a/dma.c
+++ b/dma.c
@@ -152,11 +152,13 @@ mt76_dma_tx_cleanup(struct mt76_dev *dev, enum mt76_txq_id qid, bool flush)
 		q->tail = (q->tail + 1) % q->ndesc;
 		q->queued--;
 
-		if (q->tail == last)
+		if (!flush && q->tail == last)
 		    last = ioread32(&q->regs->dma_idx);
 	}
 	if (!flush)
 		mt76_txq_schedule(dev, q);
+	else
+		iowrite32(q->tail, &q->regs->dma_idx);
 	spin_unlock_bh(&q->lock);
 }