netdev - Re: [RESEND PATCH v5 net-next 2/2] net: phy: micrel: Fix warn: passing zero to PTR

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Date:   Thu, 15 Dec 2022 07:58:57 -0800
From:   Alexander H Duyck <alexander.duyck@...il.com>
To:     Divya Koppera <Divya.Koppera@...rochip.com>, andrew@...n.ch,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        richardcochran@...il.com
Cc:     UNGLinuxDriver@...rochip.com
Subject: Re: [RESEND PATCH v5 net-next 2/2] net: phy: micrel: Fix warn:
 passing zero to PTR_ERR

On Wed, 2022-12-14 at 14:55 +0530, Divya Koppera wrote:
> Handle the NULL pointer case
> 
> Fixes New smatch warnings:
> drivers/net/phy/micrel.c:2613 lan8814_ptp_probe_once() warn: passing zero to 'PTR_ERR'
> 
> vim +/PTR_ERR +2613 drivers/net/phy/micrel.c
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Fixes: ece19502834d ("net: phy: micrel: 1588 support for LAN8814 phy")
> Signed-off-by: Divya Koppera <Divya.Koppera@...rochip.com>
> ---
> v4 -> v5:
> - Removed run time check and added compile time check for PHC
> 
> v3 -> v4:
> - Split the patch for different warnings
> - Renamed variable from shared_priv to shared.
> 
> v2 -> v3:
> - Changed subject line from net to net-next
> - Removed config check for ptp and clock configuration
>   instead added null check for ptp_clock
> - Fixed one more warning related to initialisaton.
> 
> v1 -> v2:
> - Handled NULL pointer case
> - Changed subject line with net-next to net
> ---
>  drivers/net/phy/micrel.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 1bcdb828db56..650ef53fcf20 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -3017,10 +3017,6 @@ static int lan8814_ptp_probe_once(struct phy_device *phydev)
>  {
>  	struct lan8814_shared_priv *shared = phydev->shared->priv;
> 
> -	if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK) ||
> -	    !IS_ENABLED(CONFIG_NETWORK_PHY_TIMESTAMPING))
> -		return 0;
> -
>  	/* Initialise shared lock for clock*/
>  	mutex_init(&shared->shared_lock);
> 
> @@ -3040,12 +3036,16 @@ static int lan8814_ptp_probe_once(struct phy_device *phydev)
> 
>  	shared->ptp_clock = ptp_clock_register(&shared->ptp_clock_info,
>  					       &phydev->mdio.dev);
> -	if (IS_ERR_OR_NULL(shared->ptp_clock)) {
> +	if (IS_ERR(shared->ptp_clock)) {
>  		phydev_err(phydev, "ptp_clock_register failed %lu\n",
>  			   PTR_ERR(shared->ptp_clock));
>  		return -EINVAL;
>  	}
> 
> +	/* Check if PHC support is missing at the configuration level */
> +	if (!shared->ptp_clock)
> +		return 0;
> +
>  	phydev_dbg(phydev, "successfully registered ptp clock\n");
> 
>  	shared->phydev = phydev;
> 

Looks good to me. You may need to resubmit once net-next opens.

Reviewed-by: Alexander Duyck <alexanderduyck@...com>