Re: [PATCH net-next] net: dsa: realtek: rtl8365mb: use devm_mutex_init

[Mieczyslaw Nalewaj]

On 7/18/2026 7:59 AM, Luiz Angelo Daros de Luca wrote:
> mutex_destroy() is needed while debugging mutex. Instead of calling it
> directly on driver .remove(), just use devm.
> 
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@xxxxxxxxx>
> ---
>  drivers/net/dsa/realtek/rtl8365mb_main.c | 15 ++++++++++++---
>  drivers/net/dsa/realtek/rtl83xx.c        | 14 +++++++++++---
>  2 files changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/dsa/realtek/rtl8365mb_main.c b/drivers/net/dsa/realtek/rtl8365mb_main.c
> index 5ac091bf93c9..c787fdb75413 100644
> --- a/drivers/net/dsa/realtek/rtl8365mb_main.c
> +++ b/drivers/net/dsa/realtek/rtl8365mb_main.c
> @@ -1988,16 +1988,19 @@ static void rtl8365mb_get_stats64(struct dsa_switch *ds, int port,
>  	spin_unlock(&p->stats_lock);
>  }
>  
> -static void rtl8365mb_stats_setup(struct realtek_priv *priv)
> +static int rtl8365mb_stats_setup(struct realtek_priv *priv)
>  {
>  	struct rtl8365mb *mb = priv->chip_data;
>  	struct dsa_switch *ds = &priv->ds;
>  	struct dsa_port *dp;
> +	int ret;
>  
>  	/* Per-chip global mutex to protect MIB counter access, since doing
>  	 * so requires accessing a series of registers in a particular order.
>  	 */
> -	mutex_init(&mb->mib_lock);
> +	ret = devm_mutex_init(priv->dev, &mb->mib_lock);
> +	if (ret)
> +		return ret;
>  
>  	dsa_switch_for_each_available_port(dp, ds) {
>  		struct rtl8365mb_port *p = &mb->ports[dp->index];
> @@ -2010,6 +2013,8 @@ static void rtl8365mb_stats_setup(struct realtek_priv *priv)
>  		 */
>  		INIT_DELAYED_WORK(&p->mib_work, rtl8365mb_stats_poll);
>  	}
> +
> +	return 0;
>  }
>  
>  static void rtl8365mb_stats_teardown(struct realtek_priv *priv)
> @@ -2567,7 +2572,11 @@ static int rtl8365mb_setup(struct dsa_switch *ds)
>  	}
>  
>  	/* Start statistics counter polling */
> -	rtl8365mb_stats_setup(priv);
> +	ret = rtl8365mb_stats_setup(priv);
> +	if (ret) {
> +		dev_err(priv->dev, "failed to setup stats\n");
> +		goto out_teardown_irq;
> +	}
>  
>  	return 0;
>  
> diff --git a/drivers/net/dsa/realtek/rtl83xx.c b/drivers/net/dsa/realtek/rtl83xx.c
> index 90843d52c5a8..35df809a5951 100644
> --- a/drivers/net/dsa/realtek/rtl83xx.c
> +++ b/drivers/net/dsa/realtek/rtl83xx.c
> @@ -156,9 +156,17 @@ rtl83xx_probe(struct device *dev,
>  	if (!priv)
>  		return ERR_PTR(-ENOMEM);
>  
> -	mutex_init(&priv->map_lock);
> -	mutex_init(&priv->vlan_lock);
> -	mutex_init(&priv->l2_lock);
> +	ret = devm_mutex_init(dev, &priv->map_lock);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	ret = devm_mutex_init(dev, &priv->vlan_lock);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	ret = devm_mutex_init(dev, &priv->l2_lock);
> +	if (ret)
> +		return ERR_PTR(ret);
>  
>  	rc.lock_arg = priv;
>  	priv->map = devm_regmap_init(dev, NULL, priv, &rc);
> 
> ---
> base-commit: ce6b4d3216b63f902bb8e9695ee6c10c83415f65
> change-id: 20260718-realtek_mutext-41a072e5cd24
> 
> Best regards,
> --  
> Luiz Angelo Daros de Luca <luizluca@xxxxxxxxx>
> 
> 

Reviewed-by: Mieczyslaw Nalewaj <namiltd@xxxxxxxxx>