From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH net-next 17/22] hv_netvsc: fix return type of
 ndo_start_xmit function
Date: Thu, 20 Sep 2018 07:43:41 -0700
Message-ID: <20180920074341.3acef75c@xeon-e3>
References: <20180920123306.14772-1-yuehaibing@huawei.com>
 <20180920123306.14772-18-yuehaibing@huawei.com>
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To: YueHaibing <yuehaibing@huawei.com>
Cc: dmitry.tarnyagin@lockless.no, madalin.bucur@nxp.com, linux-mips@linux-mips.org, linux@armlinux.org.uk, pantelis.antoniou@gmail.com, t.sailer@alumni.ethz.ch, dev@openvswitch.org, f.fainelli@gmail.com, arvid.brodin@alten.se, michal.simek@xilinx.com, pshelar@ovn.org, m-karicheri2@ti.com, xen-devel@lists.xenproject.org, jreuter@yaina.de, sammy@sammy.net, grygorii.strashko@ti.com, w-kwok2@ti.com, haiyangz@microsoft.com, steve.glendinning@shawell.net, linux-can@vger.kernel.org, claudiu.manoil@nxp.com, paul.durrant@citrix.com, mkl@pengutronix.de, linux-hams@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wei.liu2@citrix.com, nico@fluxnic.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, ralf@linux-mips.org, leoyang.li@nxp.com, wg@grandegger.com, devel@linuxdriverproject.org, linuxppc-dev@lists.ozlabs.orgda
List-Id: linux-can.vger.kernel.org

On Thu, 20 Sep 2018 20:33:01 +0800
YueHaibing <yuehaibing@huawei.com> wrote:

> The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
> which is a typedef for an enum type, so make sure the implementation in
> this driver has returns 'netdev_tx_t' value, and change the function
> return type to netdev_tx_t.
> 
> Found by coccinelle.
> 
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/net/hyperv/netvsc_drv.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index 3af6d8d..056c472 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -511,7 +511,8 @@ static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
>  	return rc;
>  }
>  
> -static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
> +static netdev_tx_t
> +netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
>  {
>  	struct net_device_context *net_device_ctx = netdev_priv(net);
>  	struct hv_netvsc_packet *packet = NULL;
> @@ -528,8 +529,11 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
>  	 */
>  	vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
>  	if (vf_netdev && netif_running(vf_netdev) &&
> -	    !netpoll_tx_running(net))
> -		return netvsc_vf_xmit(net, vf_netdev, skb);
> +	    !netpoll_tx_running(net)) {
> +		ret = netvsc_vf_xmit(net, vf_netdev, skb);
> +		if (ret)
> +			return NETDEV_TX_BUSY;
> +	}

Sorry, the new code is wrong. It will fall through if ret == 0 (NETDEV_TX_OK)
Please review and test your patches.