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

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Message-ID: <AANLkTilm1b61ikLi28We3aLrF3Ld4c05oFZlh3K1pORe@mail.gmail.com>
Date:	Thu, 8 Jul 2010 17:16:02 +0400
From:	Denis Kirjanov <kirjanov@...il.com>
To:	Kulikov Vasiliy <segooon@...il.com>
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 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,
> -                                        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,
> -                                        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);
> +err_tx_bd:
> +       dma_free_coherent(ndev->dev.parent, tx_bd_v_size,
> +                               lp->tx_bd_v, lp->tx_bd_p);
> +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.
> --
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>



-- 
Regards,
Denis
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