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

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Date:   Tue, 29 Nov 2022 15:46:53 +0530
From:   Divya Koppera <Divya.Koppera@...rochip.com>
To:     <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>, <Madhuri.Sripada@...rochip.com>
Subject: [PATCH v3 net-next] net: phy: micrel: Fix warn: passing zero to PTR_ERR

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'.

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