net: usb: asix: ax88772_bind return error when hw_reset fail

The ax88772_bind() should return error code immediately when the PHY
was not reset properly through ax88772a_hw_reset().
Otherwise, The asix_get_phyid() will block when get the PHY
Identifier from the PHYSID1 MII registers through asix_mdio_read()
due to the PHY isn't ready. Furthermore, it will produce a lot of
error message cause system crash.As follows:
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to write
 reg index 0x0000: -71
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to send
 software reset: ffffffb9
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to write
 reg index 0x0000: -71
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to enable
 software MII access
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to read
 reg index 0x0000: -71
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to write
 reg index 0x0000: -71
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to enable
 software MII access
asix 1-1:1.0 (unnamed net_device) (uninitialized): Failed to read
 reg index 0x0000: -71
...

Signed-off-by: Zhang Run <zhang.run@zte.com.cn>
Reviewed-by: Yang Wei <yang.wei9@zte.com.cn>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index b654f05b2ccd0b85c88cd42d52dc7c4fea44b868..3d93993e74da09abfa63252247c680be069401d3 100644 (file)
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -739,8 +739,13 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
        asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &chipcode, 0);
        chipcode &= AX_CHIPCODE_MASK;
 
-       (chipcode == AX_AX88772_CHIPCODE) ? ax88772_hw_reset(dev, 0) :
-                                           ax88772a_hw_reset(dev, 0);
+       ret = (chipcode == AX_AX88772_CHIPCODE) ? ax88772_hw_reset(dev, 0) :
+                                                 ax88772a_hw_reset(dev, 0);
+
+       if (ret < 0) {
+               netdev_dbg(dev->net, "Failed to reset AX88772: %d\n", ret);
+               return ret;
+       }
 
        /* Read PHYID register *AFTER* the PHY was reset properly */
        phyid = asix_get_phyid(dev);