linux-kernel - Re: [PATCH] net: macb: Remove redundant assignment to w0 and queue

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Message-ID: <20210428122106.2597718a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 28 Apr 2021 12:21:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com,
        davem@...emloft.net, linux@...linux.org.uk, palmer@...belt.com,
        paul.walmsley@...ive.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] net: macb: Remove redundant assignment to w0 and queue

On Wed, 28 Apr 2021 18:03:08 +0800 Jiapeng Chong wrote:
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index 0f6a6cb..5f1dbc2 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -3248,7 +3248,6 @@ static void gem_prog_cmp_regs(struct macb *bp, struct ethtool_rx_flow_spec *fs)
>  	/* ignore field if any masking set */
>  	if (tp4sp_m->ip4src == 0xFFFFFFFF) {
>  		/* 1st compare reg - IP source address */
> -		w0 = 0;
>  		w1 = 0;
>  		w0 = tp4sp_v->ip4src;
>  		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
> @@ -3262,7 +3261,6 @@ static void gem_prog_cmp_regs(struct macb *bp, struct ethtool_rx_flow_spec *fs)
>  	/* ignore field if any masking set */
>  	if (tp4sp_m->ip4dst == 0xFFFFFFFF) {
>  		/* 2nd compare reg - IP destination address */
> -		w0 = 0;
>  		w1 = 0;
>  		w0 = tp4sp_v->ip4dst;
>  		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */

Looks like this was written like that on purpose.

> @@ -4829,7 +4827,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
>  {
>  	struct net_device *netdev = dev_get_drvdata(dev);
>  	struct macb *bp = netdev_priv(netdev);
> -	struct macb_queue *queue = bp->queues;
> +	struct macb_queue *queue;
>  	unsigned long flags;
>  	unsigned int q;
>  	int err;
> @@ -4916,7 +4914,7 @@ static int __maybe_unused macb_resume(struct device *dev)
>  {
>  	struct net_device *netdev = dev_get_drvdata(dev);
>  	struct macb *bp = netdev_priv(netdev);
> -	struct macb_queue *queue = bp->queues;
> +	struct macb_queue *queue;
>  	unsigned long flags;
>  	unsigned int q;
>  	int err;

This chunk looks good!

Would you mind splitting the patch into two (1 - w0 assignments, and 
2 - queue assignments) and reposting? We can merge the latter, the
former is up to the driver maintainer to decide.