tg3: Avoid null pointer dereference in tg3_interrupt in netconsole mode

commit 9c13cb8bb477a83b9a3c9e5a5478a4e21294a760 upstream.

When netconsole is enabled, logging messages generated during tg3_open
can result in a null pointer dereference for the uninitialized tg3
status block. Use the irq_sync flag to disable polling in the early
stages. irq_sync is cleared when the driver is enabling interrupts after
all initialization is completed.

Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[PG: drivers/net/ethernet/broadcom/tg3.c --> drivers/net/tg3.c in .34]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index ecc41cffb470d3d16b97e5fe61768f57c4822d65..e6045d1998af21ba6744c9059fb2ef2fecf1fe80 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -5278,6 +5278,9 @@ static void tg3_poll_controller(struct net_device *dev)
        int i;
        struct tg3 *tp = netdev_priv(dev);
 
+       if (tg3_irq_sync(tp))
+               return;
+
        for (i = 0; i < tp->irq_cnt; i++)
                tg3_interrupt(tp->napi[i].irq_vec, &tp->napi[i]);
 }
@@ -14476,6 +14479,7 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
        tp->pm_cap = pm_cap;
        tp->rx_mode = TG3_DEF_RX_MODE;
        tp->tx_mode = TG3_DEF_TX_MODE;
+       tp->irq_sync = 1;
 
        if (tg3_debug > 0)
                tp->msg_enable = tg3_debug;