[PATCH 3.4 18/45] staging: et131x: Fix errors caused by phydev->addr accesses before initialisation

From: Zefan Li
Date: Mon Sep 22 2014 - 22:38:55 EST

From: Mark Einon <mark.einon@xxxxxxxxx>

3.4.104-rc1 review patch. If anyone has any objections, please let me know.

------------------

commit ec0a38bf8b28b036202070cf3ef271e343d9eafc upstream.

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
Signed-off-by: Mark Einon <mark.einon@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[lizf: Backported to 3.4:
- adjust context
- update more update more et131x_mii_write() calls in
et1310_phy_access_mii_bit() and et131x_xcvr_init()]
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
drivers/staging/et131x/et131x.c | 78 +++++++++++++++++----------------------
1 file changed, 34 insertions(+), 44 deletions(-)

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index 886f565..6a271e9 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -1478,22 +1478,16 @@ static int et131x_mii_read(struct et131x_adapter *adapter, u8 reg, u16 *value)
*
* Return 0 on success, errno on failure (as defined in errno.h)
*/
-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
*/
@@ -1550,6 +1544,7 @@ static void et1310_phy_access_mii_bit(struct et131x_adapter *adapter,
{
u16 reg;
u16 mask = 0x0001 << bitnum;
+ struct phy_device *phydev = adapter->phydev;

/* Read the requested register */
et131x_mii_read(adapter, regnum, &reg);
@@ -1560,11 +1555,11 @@ static void et1310_phy_access_mii_bit(struct et131x_adapter *adapter,
break;

case TRUEPHY_BIT_SET:
- et131x_mii_write(adapter, regnum, reg | mask);
+ et131x_mii_write(adapter, phydev->addr, regnum, reg | mask);
break;

case TRUEPHY_BIT_CLEAR:
- et131x_mii_write(adapter, regnum, reg & ~mask);
+ et131x_mii_write(adapter, phydev->addr, regnum, reg & ~mask);
break;

default:
@@ -1715,17 +1710,7 @@ static int et131x_mdio_write(struct mii_bus *bus, int phy_addr, int reg, u16 val
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);
}

/**
@@ -1741,12 +1726,13 @@ static int et131x_mdio_reset(struct mii_bus *bus)
static void et1310_phy_power_down(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);
}

/**
@@ -1759,6 +1745,7 @@ static void et131x_xcvr_init(struct et131x_adapter *adapter)
u16 imr;
u16 isr;
u16 lcr2;
+ struct phy_device *phydev = adapter->phydev;

et131x_mii_read(adapter, PHY_INTERRUPT_STATUS, &isr);
et131x_mii_read(adapter, PHY_INTERRUPT_MASK, &imr);
@@ -1770,7 +1757,7 @@ static void et131x_xcvr_init(struct et131x_adapter *adapter)
ET_PHY_INT_MASK_LINKSTAT &
ET_PHY_INT_MASK_ENABLE);

- et131x_mii_write(adapter, PHY_INTERRUPT_MASK, imr);
+ et131x_mii_write(adapter, phydev->addr, PHY_INTERRUPT_MASK, imr);

/* Set the LED behavior such that LED 1 indicates speed (off =
* 10Mbits, blink = 100Mbits, on = 1000Mbits) and LED 2 indicates
@@ -1791,7 +1778,7 @@ 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);
}
}

@@ -4202,14 +4189,14 @@ 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);
@@ -4221,7 +4208,8 @@ 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);
@@ -4254,14 +4242,17 @@ 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 */
@@ -5343,10 +5334,6 @@ static int __devinit 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 */
@@ -5362,7 +5349,6 @@ static int __devinit 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(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
if (!adapter->mii_bus->irq) {
dev_err(&pdev->dev, "mii_bus irq allocation failed\n");
@@ -5387,6 +5373,10 @@ static int __devinit 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
--
1.7.9.5

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