net: usb: lan78xx: Connect PHY before registering MAC

As soon as the netdev is registers, the kernel can start using the
interface. If the driver connects the MAC to the PHY after the netdev
is registered, there is a race condition where the interface can be
opened without having the PHY connected.

Change the order to close this race condition.

Fixes: 92571a1aae40 ("lan78xx: Connect phy early")
Reported-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 58f5a219fb65cdc8417ee9b19a1660b82f6f56c4..62948098191ff0462436b3b5fb677e629c45db70 100644 (file)
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -3782,10 +3782,14 @@ static int lan78xx_probe(struct usb_interface *intf,
        /* driver requires remote-wakeup capability during autosuspend. */
        intf->needs_remote_wakeup = 1;
 
+       ret = lan78xx_phy_init(dev);
+       if (ret < 0)
+               goto out4;
+
        ret = register_netdev(netdev);
        if (ret != 0) {
                netif_err(dev, probe, netdev, "couldn't register the device\n");
-               goto out4;
+               goto out5;
        }
 
        usb_set_intfdata(intf, dev);
@@ -3798,14 +3802,10 @@ static int lan78xx_probe(struct usb_interface *intf,
        pm_runtime_set_autosuspend_delay(&udev->dev,
                                         DEFAULT_AUTOSUSPEND_DELAY);
 
-       ret = lan78xx_phy_init(dev);
-       if (ret < 0)
-               goto out5;
-
        return 0;
 
 out5:
-       unregister_netdev(netdev);
+       phy_disconnect(netdev->phydev);
 out4:
        usb_free_urb(dev->urb_intr);
 out3: