Re: [PATCH net] net: mtk: wed: Fix dma_free_coherent() size mtk_wed_hwrro_free_buffer()

[Lorenzo Bianconi]

> 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@xxxxxxxxxxxxxxx>
> Signed-off-by: Thomas Fourier <fourier.thomas@xxxxxxxxx>
> ---
>  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);

I think this problem is present even in the mtk git repo. I guess we should
allocate DMA buffer using dev->hw_rro.size instead of using dev->wlan.rx_nbuf
directly.

@Sujuan: any input on it?

Regards,
Lorenzo

>  
>  free_pagelist:
> -- 
> 2.43.0
>

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