linux-kernel - Re: [PATCH v3 net-next] net: phy: micrel: Fix warn: passing zero to PTR

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Date:   Wed, 30 Nov 2022 15:50:34 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.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>, <richardcochran@...il.com>,
        <UNGLinuxDriver@...rochip.com>, <Madhuri.Sripada@...rochip.com>
Subject: Re: [PATCH v3 net-next] net: phy: micrel: Fix warn: passing zero to
 PTR_ERR

The 11/29/2022 15:46, Divya Koppera wrote:

Hi Divya,

> 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'
> 
> Fixes Old smatch warnings:
> drivers/net/phy/micrel.c:1750 ksz886x_cable_test_get_status() error:
> uninitialized symbol 'ret'.

Shouldn't you split this patch in 2 different patches, as you fix 2
issues.
Also any reason why you target net-next and not net? Because I can
see the blamed patches on net branch.

> 
> 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")
> Fixes: 21b688dabecb ("net: phy: micrel: Cable Diag feature for lan8814 phy")
> Signed-off-by: Divya Koppera <Divya.Koppera@...rochip.com>
> ---
> 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 | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 26ce0c5defcd..3703e2fafbd4 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -2088,7 +2088,8 @@ static int ksz886x_cable_test_get_status(struct phy_device *phydev,
>  	const struct kszphy_type *type = phydev->drv->driver_data;
>  	unsigned long pair_mask = type->pair_mask;
>  	int retries = 20;
> -	int pair, ret;
> +	int ret = 0;
> +	int pair;
>  
>  	*finished = false;
>  
> @@ -2970,12 +2971,13 @@ static int lan8814_config_intr(struct phy_device *phydev)
>  
>  static void lan8814_ptp_init(struct phy_device *phydev)
>  {
> +	struct lan8814_shared_priv *shared_priv = phydev->shared->priv;
>  	struct kszphy_priv *priv = phydev->priv;
>  	struct kszphy_ptp_priv *ptp_priv = &priv->ptp_priv;
>  	u32 temp;
>  
> -	if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK) ||
> -	    !IS_ENABLED(CONFIG_NETWORK_PHY_TIMESTAMPING))
> +	/* Check if PHC support is missing at the configuration level */
> +	if (!shared_priv->ptp_clock)
>  		return;
>  
>  	lanphy_write_page_reg(phydev, 5, TSU_HARD_RESET, TSU_HARD_RESET_);
> @@ -3016,10 +3018,6 @@ 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);
>  
> @@ -3039,12 +3037,16 @@ 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;
> -- 
> 2.17.1
> 

-- 
/Horatiu