netdev - [PATCH net] net: mtk: wed: Fix dma_free_coherent() size mtk_wed_hwrro_free

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Message-ID: <20260209151822.136934-2-fourier.thomas@gmail.com>
Date: Mon,  9 Feb 2026 16:18:21 +0100
From: Thomas Fourier <fourier.thomas@...il.com>
To: 
Cc: Thomas Fourier <fourier.thomas@...il.com>,
	stable@...r.kernel.org,
	Felix Fietkau <nbd@....name>,
	Sean Wang <sean.wang@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Sujuan Chen <sujuan.chen@...iatek.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH net] net: mtk: wed: Fix dma_free_coherent() size mtk_wed_hwrro_free_buffer()

The DMA buffer alloc'd in mtk_wed_hwrro_buffer_alloc() with size
dev->wlan.rx_nbuf but is freed with size dev->hw_rro.size.

Change the dealloc size to match the one used in
mtk_wed_hwrro_buffer_alloc().

Fixes: 6757d345dd7d ("net: ethernet: mtk_wed: introduce hw_rro support for MT7988")
Cc: <stable@...r.kernel.org>
Signed-off-by: Thomas Fourier <fourier.thomas@...il.com>
---
 drivers/net/ethernet/mediatek/mtk_wed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 1ed1f88dd7f8..455df564174d 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -879,7 +879,7 @@ mtk_wed_hwrro_free_buffer(struct mtk_wed_device *dev)
 		__free_page(page);
 	}
 
-	dma_free_coherent(dev->hw->dev, dev->hw_rro.size * sizeof(*desc),
+	dma_free_coherent(dev->hw->dev, dev->wlan.rx_nbuf * sizeof(*desc),
 			  desc, dev->hw_rro.desc_phys);
 
 free_pagelist:
-- 
2.43.0