linux-kernel - Re: [PATCH net] net: stmmac: Set MAC's flow control register to reflect current settings

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Message-ID: <Y3dpikbzUJAazMTD@shell.armlinux.org.uk>
Date:   Fri, 18 Nov 2022 11:16:26 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     "Goh, Wei Sheng" <wei.sheng.goh@...el.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Voon Wei Feng <weifeng.voon@...el.com>,
        Tan Tee Min <tee.min.tan@...el.com>,
        Ahmad Tarmizi Noor Azura <noor.azura.ahmad.tarmizi@...el.com>,
        Looi Hong Aun <hong.aun.looi@...el.com>
Subject: Re: [PATCH net] net: stmmac: Set MAC's flow control register to
 reflect current settings

On Fri, Nov 18, 2022 at 03:20:51PM +0800, Goh, Wei Sheng wrote:
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 8273e6a175c8..ab7f48f32f5b 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1061,8 +1061,16 @@ static void stmmac_mac_link_up(struct phylink_config *config,
>  		ctrl |= priv->hw->link.duplex;
>  
>  	/* Flow Control operation */
> -	if (tx_pause && rx_pause)
> -		stmmac_mac_flow_ctrl(priv, duplex);
> +	if (rx_pause && tx_pause)
> +		priv->flow_ctrl = FLOW_AUTO;
> +	else if (rx_pause && !tx_pause)
> +		priv->flow_ctrl = FLOW_RX;
> +	else if (!rx_pause && tx_pause)
> +		priv->flow_ctrl = FLOW_TX;
> +	else if (!rx_pause && !tx_pause)
> +		priv->flow_ctrl = FLOW_OFF;

Since "if (!rx_pause && !tx_pause)" will always be true at this point,
you can eliminate this needless last condition, which will make the code
a little more readable.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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