Subject: Re: [PATCH net v4 3/3] net: stmmac: fix unbalanced ptp clock issue in suspend/resume flow

From: Jakub Kicinski <[email-masked]>
Date: Wed, 13 Jul 2022 20:39:10 -0700

On Wed, 13 Jul 2022 18:10:02 +0800 Biao Huang wrote:
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 197fac587ad5..c230b8b9aab1 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -839,14 +839,6 @@ int stmmac_init_tstamp_counter(struct stmmac_priv *priv, u32 systime_flags)
>  	if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp))
>  		return -EOPNOTSUPP;
>  
> -	ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
> -	if (ret < 0) {
> -		netdev_warn(priv->dev,
> -			    "failed to enable PTP reference clock: %pe\n",
> -			    ERR_PTR(ret));
> -		return ret;
> -	}
> -
>  	stmmac_config_hw_tstamping(priv, priv->ptpaddr, systime_flags);
>  	priv->systime_flags = systime_flags;
>  

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:837:6: warning: unused variable 'ret' [-Wunused-variable]
        int ret;
            ^