tg3: Delay mdio bus init until fw finishes

The device firmware uses the MDIO bus during early setup.  If the driver
modifies the MDIO bus configuration while it is in use by the firmware,
any number of bad things can happen.  This patch delays MDIO setup until
after the firmware posts its magic signature, signifying initialization
is complete.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 8af2cdf..ab3159e 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -6348,14 +6348,14 @@ static int tg3_chip_reset(struct tg3 *tp)
                tw32_f(MAC_MODE, 0);
        udelay(40);
 
-       tg3_mdio_start(tp);
-
        tg3_ape_unlock(tp, TG3_APE_LOCK_GRC);
 
        err = tg3_poll_fw(tp);
        if (err)
                return err;
 
+       tg3_mdio_start(tp);
+
        if ((tp->tg3_flags2 & TG3_FLG2_PCI_EXPRESS) &&
            tp->pci_chip_rev_id != CHIPREV_ID_5750_A0) {
                val = tr32(0x7c00);