netdev - RE: [PATCH] r8152: Use guard clause and fix comment typos

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Date:   Tue, 24 Sep 2019 02:47:47 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Prashant Malani <pmalani@...omium.org>
CC:     "grundler@...omium.org" <grundler@...omium.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>
Subject: RE: [PATCH] r8152: Use guard clause and fix comment typos

Prashant Malani [mailto:pmalani@...omium.org]
> Sent: Tuesday, September 24, 2019 6:27 AM
> To: Hayes Wang
[...]
> -	do {
> +	while (1) {
>  		struct tx_agg *agg;
> +		struct net_device *netdev = tp->netdev;
> 
>  		if (skb_queue_empty(&tp->tx_queue))
>  			break;
> @@ -2188,26 +2189,25 @@ static void tx_bottom(struct r8152 *tp)
>  			break;
> 
>  		res = r8152_tx_agg_fill(tp, agg);
> -		if (res) {
> -			struct net_device *netdev = tp->netdev;
> +		if (!res)
> +			break;

I let the loop run continually until an error occurs or the queue is empty.
However, you stop the loop when r8152_tx_agg_fill() is successful.
If an error occurs continually, the loop may not be broken.

> -			if (res == -ENODEV) {
> -				rtl_set_unplug(tp);
> -				netif_device_detach(netdev);
> -			} else {
> -				struct net_device_stats *stats = &netdev->stats;
> -				unsigned long flags;
> +		if (res == -ENODEV) {
> +			rtl_set_unplug(tp);
> +			netif_device_detach(netdev);
> +		} else {
> +			struct net_device_stats *stats = &netdev->stats;
> +			unsigned long flags;
> 
> -				netif_warn(tp, tx_err, netdev,
> -					   "failed tx_urb %d\n", res);
> -				stats->tx_dropped += agg->skb_num;
> +			netif_warn(tp, tx_err, netdev,
> +				   "failed tx_urb %d\n", res);
> +			stats->tx_dropped += agg->skb_num;
> 
> -				spin_lock_irqsave(&tp->tx_lock, flags);
> -				list_add_tail(&agg->list, &tp->tx_free);
> -				spin_unlock_irqrestore(&tp->tx_lock, flags);
> -			}
> +			spin_lock_irqsave(&tp->tx_lock, flags);
> +			list_add_tail(&agg->list, &tp->tx_free);
> +			spin_unlock_irqrestore(&tp->tx_lock, flags);
>  		}
> -	} while (res == 0);
> +	}

I think the behavior is different from the current one.

Best Regards,
Hayes