netdev - Re: [PATCH] ethernet: Delete unnecessary checks before the macro call “dev_kfree

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Date:   Fri, 23 Aug 2019 09:10:02 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Markus Elfring <Markus.Elfring@....de>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        intel-wired-lan@...ts.osuosl.org,
        bcm-kernel-feedback-list@...adcom.com,
        UNGLinuxDriver@...rochip.com,
        Alexandre Torgue <alexandre.torgue@...com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Allison Randal <allison@...utok.net>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Berger <opendmb@...il.com>,
        Douglas Miller <dougmill@...ux.ibm.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Jilayne Lovejoy <opensource@...ayne.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Kate Stewart <kstewart@...uxfoundation.org>
Cc:     kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ethernet: Delete unnecessary checks before the macro call “dev_kfree_skb”


On 2019-08-23 7:08 a.m., Christophe JAILLET wrote:
> Hi,
>
> in this patch, there is one piece that looked better before. (see below)
>
> Removing the 'if (skb)' is fine, but concatening everything in one 
> statement just to save 2 variables and a few LOC is of no use, IMHO, 
> and the code is less readable.
Agreed.
>
> just my 2c.
>
>
> CJ
>
>
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c 
> b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index d3a0b614dbfa..8b19ddcdafaa 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -2515,19 +2515,14 @@ static int bcmgenet_dma_teardown(struct 
> bcmgenet_priv *priv)
>  static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
>  {
>      struct netdev_queue *txq;
> -    struct sk_buff *skb;
> -    struct enet_cb *cb;
>      int i;
>
>      bcmgenet_fini_rx_napi(priv);
>      bcmgenet_fini_tx_napi(priv);
>
> -    for (i = 0; i < priv->num_tx_bds; i++) {
> -        cb = priv->tx_cbs + i;
> -        skb = bcmgenet_free_tx_cb(&priv->pdev->dev, cb);
> -        if (skb)
> -            dev_kfree_skb(skb);
> -    }
> +    for (i = 0; i < priv->num_tx_bds; i++)
> + dev_kfree_skb(bcmgenet_free_tx_cb(&priv->pdev->dev,
> +                          priv->tx_cbs + i));
>
>      for (i = 0; i < priv->hw_params->tx_queues; i++) {
>          txq = netdev_get_tx_queue(priv->dev, priv->tx_rings[i].queue);