netdev - Re: [PATCH -next] net: macb: fix missing unlock on error in macb_start

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Message-ID: <1119c72d-2731-4bb4-bc52-316a5611c48b@gmail.com>
Date:   Mon, 12 Sep 2016 19:40:27 +0200
From:   Helmut Buchsbaum <helmut.buchsbaum@...il.com>
To:     Wei Yongjun <weiyj.lk@...il.com>,
        Nicolas Ferre <nicolas.ferre@...el.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH -next] net: macb: fix missing unlock on error in
 macb_start_xmit()

On 09/10/2016 01:17 PM, Wei Yongjun wrote:
> From: Wei Yongjun <weiyongjun1@...wei.com>
>
> Fix missing unlock before return from function macb_start_xmit()
> in the error handling case.
>
> Fixes: 007e4ba3ee13 ("net: macb: initialize checksum when using
> checksum offloading")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
>  drivers/net/ethernet/cadence/macb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 0294b6a..63144bb 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -1398,7 +1398,7 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
>
>  	if (macb_clear_csum(skb)) {
>  		dev_kfree_skb_any(skb);
> -		return NETDEV_TX_OK;
> +		goto unlock;
>  	}
>
>  	/* Map socket buffer for DMA transfer */
>
You are definitely right. Sorry I missed that obvious point and for 
causing any inconveniences.

BTW, I see there are obviously quite a few users of MACB 
implementations. I'm just curious if anybody else ever encountered the 
checksum problem or if this a matter of Zynq implementation only.

Regards,
Helmut