linux-kernel - RE: [PATCH net] net: hns: Fix the device being used for dma mapping during TX

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Message-ID: <8729016553E3654398EA69218DA29EEF15A6FB63@cnshjmbx02>
Date:   Thu, 9 Feb 2017 09:35:52 +0000
From:   YUAN Linyu <Linyu.Yuan@...atel-sbell.com.cn>
To:     Salil Mehta <salil.mehta@...wei.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "yisen.zhuang@...wei.com" <yisen.zhuang@...wei.com>,
        "mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        Kejian Yan <yankejian@...wei.com>
Subject: RE: [PATCH net] net: hns: Fix the device being used for dma mapping
 during TX



> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Salil Mehta
> Sent: Thursday, February 09, 2017 5:24 PM
> To: davem@...emloft.net
> Cc: salil.mehta@...wei.com; yisen.zhuang@...wei.com;
> mehta.salil.lnk@...il.com; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org; linuxarm@...wei.com; Kejian Yan
> Subject: [PATCH net] net: hns: Fix the device being used for dma mapping during
> TX
> 
> From: Kejian Yan <yankejian@...wei.com>
> 
> This patch fixes the device being used to DMA map skb->data.
> Erroneous device assignment causes the crash when SMMU is enabled.
> This happens during TX since buffer gets DMA mapped with device
> correspondign to net_device and gets unmapped using the device
> related to DSAF.
> 
> Signed-off-by: Kejian Yan <yankejian@...wei.com>
> Reviewed-by: Yisen Zhuang <yisen.zhuang@...wei.com>
> Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> ---
>  drivers/net/ethernet/hisilicon/hns/hns_enet.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> index 672b646..2b52a12 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> @@ -305,7 +305,7 @@ int hns_nic_net_xmit_hw(struct net_device *ndev,
>  			struct hns_nic_ring_data *ring_data)
>  {
>  	struct hns_nic_priv *priv = netdev_priv(ndev);
> -	struct device *dev = priv->dev;
> +	struct device *dev = ring_to_dev(ring_data->ring);
>  	struct hnae_ring *ring = ring_data->ring;
struct device *dev = ring_to_dev(ring); ??????
>  	struct netdev_queue *dev_queue;
>  	struct skb_frag_struct *frag;
> --
> 1.7.9.5
>