From 3b4f938409507554a77f09985c25ec26f69b307b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 24 Mar 2020 11:57:43 +0100
Subject: [PATCH] mt76: add memory barrier to DMA queue kick

Ensure that descriptor memory has been fully written before letting the
hardware read it

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 dma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dma.c b/dma.c
index 75e65977..126be590 100644
--- a/dma.c
+++ b/dma.c
@@ -137,6 +137,7 @@ mt76_dma_sync_idx(struct mt76_dev *dev, struct mt76_queue *q)
 static void
 mt76_dma_kick_queue(struct mt76_dev *dev, struct mt76_queue *q)
 {
+	wmb();
 	writel(q->head, &q->regs->cpu_idx);
 }