staging: et131x: Fix errors caused by phydev->addr accesses before initialisation

Fix two reported bugs, caused by et131x_adapter->phydev->addr being accessed
before it is initialised, by:

- letting et131x_mii_write() take a phydev address, instead of using the one
  stored in adapter by default. This is so et131x_mdio_write() can use it's own
  addr value.
- removing implementation of et131x_mdio_reset(), as it's not needed.
- moving a call to et131x_disable_phy_coma() in et131x_pci_setup(), which uses
  phydev->addr, until after the mdiobus has been registered.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=80751
Link: https://bugzilla.kernel.org/show_bug.cgi?id=77121
Cc: stable@vger.kernel.org
Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index 8bf1eb4..831b7c6 100644 (file)
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -1421,22 +1421,16 @@ static int et131x_mii_read(struct et131x_adapter *adapter, u8 reg, u16 *value)
  * @reg: the register to read
  * @value: 16-bit value to write
  */
-static int et131x_mii_write(struct et131x_adapter *adapter, u8 reg, u16 value)
+static int et131x_mii_write(struct et131x_adapter *adapter, u8 addr, u8 reg,
+                           u16 value)
 {
        struct mac_regs __iomem *mac = &adapter->regs->mac;
-       struct phy_device *phydev = adapter->phydev;
        int status = 0;
-       u8 addr;
        u32 delay = 0;
        u32 mii_addr;
        u32 mii_cmd;
        u32 mii_indicator;
 
-       if (!phydev)
-               return -EIO;
-
-       addr = phydev->addr;
-
        /* Save a local copy of the registers we are dealing with so we can
         * set them back
         */
@@ -1631,17 +1625,7 @@ static int et131x_mdio_write(struct mii_bus *bus, int phy_addr,
        struct net_device *netdev = bus->priv;
        struct et131x_adapter *adapter = netdev_priv(netdev);
 
-       return et131x_mii_write(adapter, reg, value);
-}
-
-static int et131x_mdio_reset(struct mii_bus *bus)
-{
-       struct net_device *netdev = bus->priv;
-       struct et131x_adapter *adapter = netdev_priv(netdev);
-
-       et131x_mii_write(adapter, MII_BMCR, BMCR_RESET);
-
-       return 0;
+       return et131x_mii_write(adapter, phy_addr, reg, value);
 }
 
 /*     et1310_phy_power_switch -       PHY power control
@@ -1656,18 +1640,20 @@ static int et131x_mdio_reset(struct mii_bus *bus)
 static void et1310_phy_power_switch(struct et131x_adapter *adapter, bool down)
 {
        u16 data;
+       struct  phy_device *phydev = adapter->phydev;
 
        et131x_mii_read(adapter, MII_BMCR, &data);
        data &= ~BMCR_PDOWN;
        if (down)
                data |= BMCR_PDOWN;
-       et131x_mii_write(adapter, MII_BMCR, data);
+       et131x_mii_write(adapter, phydev->addr, MII_BMCR, data);
 }
 
 /* et131x_xcvr_init - Init the phy if we are setting it into force mode */
 static void et131x_xcvr_init(struct et131x_adapter *adapter)
 {
        u16 lcr2;
+       struct  phy_device *phydev = adapter->phydev;
 
        /* Set the LED behavior such that LED 1 indicates speed (off =
         * 10Mbits, blink = 100Mbits, on = 1000Mbits) and LED 2 indicates
@@ -1688,7 +1674,7 @@ static void et131x_xcvr_init(struct et131x_adapter *adapter)
                else
                        lcr2 |= (LED_VAL_LINKON << LED_TXRX_SHIFT);
 
-               et131x_mii_write(adapter, PHY_LED_2, lcr2);
+               et131x_mii_write(adapter, phydev->addr, PHY_LED_2, lcr2);
        }
 }
 
@@ -3643,14 +3629,14 @@ static void et131x_adjust_link(struct net_device *netdev)
 
                        et131x_mii_read(adapter, PHY_MPHY_CONTROL_REG,
                                         &register18);
-                       et131x_mii_write(adapter, PHY_MPHY_CONTROL_REG,
-                                        register18 | 0x4);
-                       et131x_mii_write(adapter, PHY_INDEX_REG,
+                       et131x_mii_write(adapter, phydev->addr,
+                                        PHY_MPHY_CONTROL_REG, register18 | 0x4);
+                       et131x_mii_write(adapter, phydev->addr, PHY_INDEX_REG,
                                         register18 | 0x8402);
-                       et131x_mii_write(adapter, PHY_DATA_REG,
+                       et131x_mii_write(adapter, phydev->addr, PHY_DATA_REG,
                                         register18 | 511);
-                       et131x_mii_write(adapter, PHY_MPHY_CONTROL_REG,
-                                        register18);
+                       et131x_mii_write(adapter, phydev->addr,
+                                        PHY_MPHY_CONTROL_REG, register18);
                }
 
                et1310_config_flow_control(adapter);
@@ -3662,7 +3648,8 @@ static void et131x_adjust_link(struct net_device *netdev)
                        et131x_mii_read(adapter, PHY_CONFIG, &reg);
                        reg &= ~ET_PHY_CONFIG_TX_FIFO_DEPTH;
                        reg |= ET_PHY_CONFIG_FIFO_DEPTH_32;
-                       et131x_mii_write(adapter, PHY_CONFIG, reg);
+                       et131x_mii_write(adapter, phydev->addr, PHY_CONFIG,
+                                        reg);
                }
 
                et131x_set_rx_dma_timer(adapter);
@@ -3675,14 +3662,14 @@ static void et131x_adjust_link(struct net_device *netdev)
 
                        et131x_mii_read(adapter, PHY_MPHY_CONTROL_REG,
                                         &register18);
-                       et131x_mii_write(adapter, PHY_MPHY_CONTROL_REG,
-                                        register18 | 0x4);
-                       et131x_mii_write(adapter, PHY_INDEX_REG,
-                                        register18 | 0x8402);
-                       et131x_mii_write(adapter, PHY_DATA_REG,
-                                        register18 | 511);
-                       et131x_mii_write(adapter, PHY_MPHY_CONTROL_REG,
-                                        register18);
+                       et131x_mii_write(adapter, phydev->addr,
+                                       PHY_MPHY_CONTROL_REG, register18 | 0x4);
+                       et131x_mii_write(adapter, phydev->addr,
+                                       PHY_INDEX_REG, register18 | 0x8402);
+                       et131x_mii_write(adapter, phydev->addr,
+                                       PHY_DATA_REG, register18 | 511);
+                       et131x_mii_write(adapter, phydev->addr,
+                                       PHY_MPHY_CONTROL_REG, register18);
                }
 
                /* Free the packets being actively sent & stopped */
@@ -4644,10 +4631,6 @@ static int et131x_pci_setup(struct pci_dev *pdev,
        /* Copy address into the net_device struct */
        memcpy(netdev->dev_addr, adapter->addr, ETH_ALEN);
 
-       /* Init variable for counting how long we do not have link status */
-       adapter->boot_coma = 0;
-       et1310_disable_phy_coma(adapter);
-
        rc = -ENOMEM;
 
        /* Setup the mii_bus struct */
@@ -4663,7 +4646,6 @@ static int et131x_pci_setup(struct pci_dev *pdev,
        adapter->mii_bus->priv = netdev;
        adapter->mii_bus->read = et131x_mdio_read;
        adapter->mii_bus->write = et131x_mdio_write;
-       adapter->mii_bus->reset = et131x_mdio_reset;
        adapter->mii_bus->irq = kmalloc_array(PHY_MAX_ADDR, sizeof(int),
                                              GFP_KERNEL);
        if (!adapter->mii_bus->irq)
@@ -4687,6 +4669,10 @@ static int et131x_pci_setup(struct pci_dev *pdev,
        /* Setup et1310 as per the documentation */
        et131x_adapter_setup(adapter);
 
+       /* Init variable for counting how long we do not have link status */
+       adapter->boot_coma = 0;
+       et1310_disable_phy_coma(adapter);
+
        /* We can enable interrupts now
         *
         *  NOTE - Because registration of interrupt handler is done in the