netdev - RE: [PATCH] dpaa_eth: fix DMA mapping leak

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Date:   Mon, 23 Dec 2019 06:50:03 +0000
From:   "Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>
To:     David Miller <davem@...emloft.net>,
        "Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] dpaa_eth: fix DMA mapping leak

> -----Original Message-----
> From: David Miller <davem@...emloft.net>
> Sent: Saturday, December 21, 2019 7:36 AM
> To: Madalin Bucur <madalin.bucur@....com>; Madalin Bucur (OSS)
> <madalin.bucur@....nxp.com>
> Cc: netdev@...r.kernel.org
> Subject: Re: [PATCH] dpaa_eth: fix DMA mapping leak
> 
> From: Madalin Bucur <madalin.bucur@....nxp.com>
> Date: Thu, 19 Dec 2019 16:08:48 +0200
> 
> > @@ -1744,6 +1744,9 @@ static struct sk_buff *sg_fd_to_skb(const struct
> dpaa_priv *priv,
> >  		count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
> >  		dma_unmap_page(priv->rx_dma_dev, sg_addr,
> >  			       DPAA_BP_RAW_SIZE, DMA_FROM_DEVICE);
> > +
> > +		j++; /* fragments up to j were DMA unmapped */
> > +
> 
> You can move this code:
> 
> 		/* We may use multiple Rx pools */
> 		dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
> 		if (!dpaa_bp)
> 			goto free_buffers;
> 
> 		count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
> 
> after the dma_unmap_page() call and that is such a much simpler
> way to fix this bug.

Thank you, that will yield a simpler cleanup path.