From 1df54335590bb025c3bd706a9ba9c6e73a1d3000 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 24 Jul 2026 12:47:58 +0000 Subject: [PATCH] wifi: mt76: only consume the WO drop bit on WED v2 devices The RX path is handled by the WO MCU only on WED v2 hardware. On WED v3 the same buf1 bit does not carry drop information, so evaluating it there causes spurious RX drops. Fixes: e4d2b8bcac11 ("wifi: mt76: drop the incorrect scatter and gather frame") Link: https://patch.msgid.link/20260724124813.3961474-14-nbd@nbd.name Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/dma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c index bd8ee5260acc..f695a1459606 100644 --- a/drivers/net/wireless/mediatek/mt76/dma.c +++ b/drivers/net/wireless/mediatek/mt76/dma.c @@ -547,8 +547,13 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx, t->ptr = NULL; mt76_put_rxwi(dev, t); - if (drop) +#ifdef CONFIG_NET_MEDIATEK_SOC_WED + /* the WO MCU owns the RX path only on WED v2, on newer + * versions this buf1 bit carries no drop information + */ + if (drop && dev->mmio.wed.version == 2) *drop |= !!(buf1 & MT_DMA_CTL_WO_DROP); +#endif } else { dma_sync_single_for_cpu(dev->dma_dev, e->dma_addr[0], SKB_WITH_OVERHEAD(q->buf_size),