netdev - Re: [PATCH 3/4] ll_temac: free everything on error path

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Date:	Thu, 8 Jul 2010 17:46:54 +0400
From:	Kulikov Vasiliy <segooon@...il.com>
To:	dkirjanov@...nel.org
Cc:	Kernel Janitors <kernel-janitors@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	John Linn <john.linn@...inx.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Jiri Pirko <jpirko@...hat.com>,
	Brian Hill <brian.hill@...inx.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 3/4] ll_temac: free everything on error path

On Thu, Jul 08, 2010 at 17:16 +0400, Denis Kirjanov wrote:
> On Thu, Jul 8, 2010 at 4:10 PM, Kulikov Vasiliy <segooon@...il.com> wrote:
> > temac_dma_bd_init() must free all allocated resources: memory, dma, skbs.
> >
> > Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
> > ---
> >  drivers/net/ll_temac_main.c |   30 +++++++++++++++++++++++++-----
> >  1 files changed, 25 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/ll_temac_main.c b/drivers/net/ll_temac_main.c
> > index a2da3d7..38d658a 100644
> > --- a/drivers/net/ll_temac_main.c
> > +++ b/drivers/net/ll_temac_main.c
> > @@ -200,6 +200,7 @@ static int temac_dma_bd_init(struct net_device *ndev)
> >        struct temac_local *lp = netdev_priv(ndev);
> >        struct sk_buff *skb;
> >        int i;
> > +       int tx_bd_v_size, rx_bd_v_size;
> >
> >        lp->rx_skb = kzalloc(sizeof(*lp->rx_skb) * RX_BD_NUM, GFP_KERNEL);
> >        if (!lp->rx_skb) {
> > @@ -209,21 +210,23 @@ static int temac_dma_bd_init(struct net_device *ndev)
> >        }
> >        /* allocate the tx and rx ring buffer descriptors. */
> >        /* returns a virtual addres and a physical address. */
> > +       tx_bd_v_size = sizeof(*lp->tx_bd_v) * TX_BD_NUM;
> >        lp->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
           ^^^^^^^^^^^
            1st
> > -                                        sizeof(*lp->tx_bd_v) * TX_BD_NUM,
> > +                                       tx_bd_v_size,
> >                                         &lp->tx_bd_p, GFP_KERNEL);
> >        if (!lp->tx_bd_v) {
> >                dev_err(&ndev->dev,
> >                                "unable to allocate DMA TX buffer descriptors");
> > -               goto out;
> > +               goto err_rx_skb;
> >        }
> > +       rx_bd_v_size = sizeof(*lp->rx_bd_v) * RX_BD_NUM;
> >        lp->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
           ^^^^^^^^^^^
            2nd
> > -                                        sizeof(*lp->rx_bd_v) * RX_BD_NUM,
> > +                                        rx_bd_v_size,
> >                                         &lp->rx_bd_p, GFP_KERNEL);
> >        if (!lp->rx_bd_v) {
> >                dev_err(&ndev->dev,
> >                                "unable to allocate DMA RX buffer descriptors");
> > -               goto out;
> > +               goto err_tx_bd;
> >        }
> >
> >        memset(lp->tx_bd_v, 0, sizeof(*lp->tx_bd_v) * TX_BD_NUM);
> > @@ -242,7 +245,7 @@ static int temac_dma_bd_init(struct net_device *ndev)
> >
> >                if (skb == 0) {
> >                        dev_err(&ndev->dev, "alloc_skb error %d\n", i);
> > -                       goto out;
> > +                       goto err_dma_single;
> >                }
> >                lp->rx_skb[i] = skb;
> >                /* returns physical address of skb->data */
> > @@ -274,6 +277,23 @@ static int temac_dma_bd_init(struct net_device *ndev)
> >
> >        return 0;
> >
> > +err_dma_single:
> > +       for (i = 0; i < RX_BD_NUM; i++) {
> > +               if (lp->rx_skb[i] == NULL)
> > +                       break;
> > +
> > +               kfree_skb(lp->rx_skb[i]);
> > +               dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
> > +                               XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE);
> > +       }
> > +
> > +       dma_free_coherent(ndev->dev.parent, rx_bd_v_size,
> > +                               lp->rx_bd_v, lp->rx_bd_p);
                                    ^^^^^^^^^^^
                                     2nd
> > +err_tx_bd:
> > +       dma_free_coherent(ndev->dev.parent, tx_bd_v_size,
> > +                               lp->tx_bd_v, lp->tx_bd_p);
                                    ^^^^^^^^^^^
                                     1st
> > +err_rx_skb:
> > +       kfree(lp->rx_skb);
> >  out:
> >        return -ENOMEM;
> >  }
> > --
> > 1.7.0.4
> This is not enough. DMA resources also must be released on exit.
Could you point to it? I see only two variables with allocated DMA (see above).
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