linux-kernel - Re: [PATCH] net: stmmac: Variable "val" in function sun8i_dwmac_set

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Message-Id: <20190206.201736.1146228626076916564.davem@davemloft.net>
Date:   Wed, 06 Feb 2019 20:17:36 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     yzhai003@....edu
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, peppe.cavallaro@...com,
        alexandre.torgue@...com, maxime.ripard@...e-electrons.com,
        wens@...e.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: Variable "val" in function
 sun8i_dwmac_set_syscon() could be uninitialized

From: Yizhuo <yzhai003@....edu>
Date: Tue,  5 Feb 2019 14:15:59 -0800

> @@ -639,9 +639,14 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
>  	struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
>  	struct device_node *node = priv->device->of_node;
>  	int ret;
> -	u32 reg, val;
> +	u32 reg, val = 0;
> +
> +	ret = regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
> +	if (ret) {
> +		dev_err(priv->device, "Fail to read SYSCON_EMAC_REG.\n");
> +		return ret;
> +	}

I agree with the other reviewer that since you check 'ret' the initialization of
'val' is no longer needed.