netdev - Re: [PATCH net-next] net: dsa: qca8k: fix missing unlock on error in qca8k_vlan

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Date:   Tue, 18 May 2021 19:27:27 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Wei Yongjun <weiyongjun1@...wei.com>
Cc:     Ansuel Smith <ansuelsmth@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, Hulk Robot <hulkci@...wei.com>
Subject: Re: [PATCH net-next] net: dsa: qca8k: fix missing unlock on error in
 qca8k_vlan_(add|del)

Hi Yongjun,

On Tue, May 18, 2021 at 11:24:13AM +0000, Wei Yongjun wrote:
> Add the missing unlock before return from function qca8k_vlan_add()
> and qca8k_vlan_del() in the error handling case.
> 
> Fixes: 028f5f8ef44f ("net: dsa: qca8k: handle error with qca8k_read operation")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>

>  drivers/net/dsa/qca8k.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index 4753228f02b3..1f1b7c4dda13 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -506,8 +506,10 @@ qca8k_vlan_add(struct qca8k_priv *priv, u8 port, u16 vid, bool untagged)
>  		goto out;
>  
>  	reg = qca8k_read(priv, QCA8K_REG_VTU_FUNC0);
> -	if (reg < 0)
> -		return reg;
> +	if (reg < 0) {
> +		ret = reg;
> +		goto out;
> +	}

This is fuzzy and has been pointed out before by Russell. reg is unsigned, ret is signed.
An extra patch would be good to use an "int" everywhere.

>  	reg |= QCA8K_VTU_FUNC0_VALID | QCA8K_VTU_FUNC0_IVL_EN;
>  	reg &= ~(QCA8K_VTU_FUNC0_EG_MODE_MASK << QCA8K_VTU_FUNC0_EG_MODE_S(port));
>  	if (untagged)
> @@ -519,7 +521,7 @@ qca8k_vlan_add(struct qca8k_priv *priv, u8 port, u16 vid, bool untagged)
>  
>  	ret = qca8k_write(priv, QCA8K_REG_VTU_FUNC0, reg);
>  	if (ret)
> -		return ret;
> +		goto out;
>  	ret = qca8k_vlan_access(priv, QCA8K_VLAN_LOAD, vid);
>  
>  out:
> @@ -541,8 +543,10 @@ qca8k_vlan_del(struct qca8k_priv *priv, u8 port, u16 vid)
>  		goto out;
>  
>  	reg = qca8k_read(priv, QCA8K_REG_VTU_FUNC0);
> -	if (reg < 0)
> -		return reg;
> +	if (reg < 0) {
> +		ret = reg;
> +		goto out;
> +	}
>  	reg &= ~(3 << QCA8K_VTU_FUNC0_EG_MODE_S(port));
>  	reg |= QCA8K_VTU_FUNC0_EG_MODE_NOT <<
>  			QCA8K_VTU_FUNC0_EG_MODE_S(port);
> @@ -564,7 +568,7 @@ qca8k_vlan_del(struct qca8k_priv *priv, u8 port, u16 vid)
>  	} else {
>  		ret = qca8k_write(priv, QCA8K_REG_VTU_FUNC0, reg);
>  		if (ret)
> -			return ret;
> +			goto out;
>  		ret = qca8k_vlan_access(priv, QCA8K_VLAN_LOAD, vid);
>  	}
>  
>