[PATCH] wifi: mt76: fix potential memory leakage

[Lorenzo Bianconi]

> From: Bo Jiao <Bo.Jiao at mediatek.com>
> 
> fix potential memory leakage, recycle rxwi when mt76_dma_add_buf() call fails.
> 
> Signed-off-by: Bo Jiao <Bo.Jiao at mediatek.com>
> ---
>  drivers/net/wireless/mediatek/mt76/dma.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
> index fc24b35..9053344 100644
> --- a/drivers/net/wireless/mediatek/mt76/dma.c
> +++ b/drivers/net/wireless/mediatek/mt76/dma.c
> @@ -592,6 +592,7 @@ mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q)
>  		qbuf.len = len - offset;
>  		qbuf.skip_unmap = false;
>  		if (mt76_dma_add_buf(dev, q, &qbuf, 1, 0, buf, t) < 0) {
> +			mt76_put_rxwi(dev, t);

I think we should add it even if page_frag_alloc or dma_map_single fail.

Regards,
Lorenzo

>  			dma_unmap_single(dev->dma_dev, addr, len,
>  					 DMA_FROM_DEVICE);
>  			skb_free_frag(buf);
> -- 
> 2.18.0
> 
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