[PATCH] wifi: mt76: drop the incorrect scatter and gather frame

[Sujuan Chen]

From: Peter Chiu <chui-hao.chiu at mediatek.com>

The scatter and gather frame may be incorrect because WED and WO may
send frames to host driver interleaved.

Signed-off-by: Peter Chiu <chui-hao.chiu at mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/dma.c | 6 ++++--
 drivers/net/wireless/mediatek/mt76/dma.h | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
index da281cd1d36f..738d7e1569bf 100644
--- a/drivers/net/wireless/mediatek/mt76/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/dma.c
@@ -402,8 +402,8 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 		*info = le32_to_cpu(desc->info);
 
 	if (mt76_queue_is_wed_rx(q)) {
-		u32 token = FIELD_GET(MT_DMA_CTL_TOKEN,
-				      le32_to_cpu(desc->buf1));
+		u32 buf1 = le32_to_cpu(desc->buf1);
+		u32 token = FIELD_GET(MT_DMA_CTL_TOKEN, buf1);
 		struct mt76_txwi_cache *t = mt76_rx_token_release(dev, token);
 
 		if (!t)
@@ -424,6 +424,8 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 
 			*drop = !!(ctrl & (MT_DMA_CTL_TO_HOST_A |
 					   MT_DMA_CTL_DROP));
+
+			*drop |= !!(buf1 & MT_DMA_CTL_WO_DROP);
 		}
 	} else {
 		buf = e->buf;
diff --git a/drivers/net/wireless/mediatek/mt76/dma.h b/drivers/net/wireless/mediatek/mt76/dma.h
index 4b9bc7f462b8..1b090d78cd05 100644
--- a/drivers/net/wireless/mediatek/mt76/dma.h
+++ b/drivers/net/wireless/mediatek/mt76/dma.h
@@ -19,6 +19,7 @@
 #define MT_DMA_CTL_TO_HOST_A		BIT(12)
 #define MT_DMA_CTL_DROP			BIT(14)
 #define MT_DMA_CTL_TOKEN		GENMASK(31, 16)
+#define MT_DMA_CTL_WO_DROP		BIT(8)
 
 #define MT_DMA_PPE_CPU_REASON		GENMASK(15, 11)
 #define MT_DMA_PPE_ENTRY		GENMASK(30, 16)
-- 
2.39.0