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

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Date:   Mon, 18 Jul 2022 06:42:03 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Divya Koppera <Divya.Koppera@...rochip.com>
Cc:     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, UNGLinuxDriver@...rochip.com,
        Madhuri.Sripada@...rochip.com
Subject: Re: [PATCH net-next] net: phy: micrel: Fix warn: passing zero to
 PTR_ERR

On Mon, Jul 18, 2022 at 05:13:33PM +0530, Divya Koppera wrote:
> Removing NULL check, as using it here is not valid

NAK.

Please read the code:

 * ptp_clock_register() - register a PTP hardware clock driver
 *
 * @info:   Structure describing the new clock.
 * @parent: Pointer to the parent device of the new clock.
 *
 * Returns a valid pointer on success or PTR_ERR on failure.  If PHC
 * support is missing at the configuration level, this function
 * returns NULL, and drivers are expected to gracefully handle that
 * case separately.


You must handle the NULL pointer case.

Thanks,
Richard


> 
> 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>
> ---
>  drivers/net/phy/micrel.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index e78d0bf69bc3..04146b936786 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -2812,7 +2812,7 @@ 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;
> -- 
> 2.17.1
>