[PATCH net-next v2 6/8] net: usb: asix: add error handling for asix_mdio_* functions

Oleksij Rempel
2021-06-07T08:27:45Z

This usb devices can be removed at any time, so we need to forward
correct error value if device was detached.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/usb/asix_common.c | 42 +++++++++++++++++++++++------------
1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
index 085bc8281082..ac92bc52a85e 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -485,18 +485,23 @@ int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
return ret;
}

- asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
- (__u16)loc, 2, &res, 0);
- asix_set_hw_mii(dev, 0);
+ ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2,
+ &res, 0);
+ if (ret < 0)
+ goto out;
+
+ ret = asix_set_hw_mii(dev, 0);
+out:
mutex_unlock(&dev->phy_mutex);

netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
phy_id, loc, le16_to_cpu(res));

- return le16_to_cpu(res);
+ return ret < 0 ? ret : le16_to_cpu(res);
}

-void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
+static int __asix_mdio_write(struct net_device *netdev, int phy_id, int loc,
+ int val)
{
struct usbnet *dev = netdev_priv(netdev);
__le16 res = cpu_to_le16(val);
@@ -516,15 +521,25 @@ void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
0, 0, 1, &smsr, 0);
} while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
- if (ret == -ENODEV) {
- mutex_unlock(&dev->phy_mutex);
- return;
- }

- asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
- (__u16)loc, 2, &res, 0);
- asix_set_hw_mii(dev, 0);
+ if (ret == -ENODEV)
+ goto out;
+
+ ret = asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2,
+ &res, 0);
+ if (ret < 0)
+ goto out;
+
+ ret = asix_set_hw_mii(dev, 0);
+out:
mutex_unlock(&dev->phy_mutex);
+
+ return ret < 0 ? ret : 0;
+}
+
+void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
+{
+ __asix_mdio_write(netdev, phy_id, loc, val);
}

/* MDIO read and write wrappers for phylib */
@@ -539,8 +554,7 @@ int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
{
struct usbnet *priv = bus->priv;

- asix_mdio_write(priv->net, phy_id, regnum, val);
- return 0;
+ return __asix_mdio_write(priv->net, phy_id, regnum, val);
}

int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
--
2.29.2