[PATCH net-next v4 01/10] net: usb: lan78xx: handle errors in lan7801 PHY initialization

[Oleksij Rempel]

Add error handling for `lan78xx_write_reg()` and `lan78xx_read_reg()`
in `lan7801_phy_init()`. If any register operation fails, return
an appropriate error using `ERR_PTR(ret)` to prevent further execution
with invalid configurations.

Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
 drivers/net/usb/lan78xx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 137adf6d5b08..d03668c2c1c9 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2531,11 +2531,22 @@ static struct phy_device *lan7801_phy_init(struct lan78xx_net *dev)
 		dev->interface = PHY_INTERFACE_MODE_RGMII;
 		ret = lan78xx_write_reg(dev, MAC_RGMII_ID,
 					MAC_RGMII_ID_TXC_DELAY_EN_);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
 		ret = lan78xx_write_reg(dev, RGMII_TX_BYP_DLL, 0x3D00);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
 		ret = lan78xx_read_reg(dev, HW_CFG, &buf);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
 		buf |= HW_CFG_CLK125_EN_;
 		buf |= HW_CFG_REFCLK25_EN_;
 		ret = lan78xx_write_reg(dev, HW_CFG, buf);
+		if (ret < 0)
+			return ERR_PTR(ret);
 	} else {
 		if (!phydev->drv) {
 			netdev_err(dev->net, "no PHY driver found\n");
-- 
2.39.5