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tg3: Avoid null pointer dereference in tg3_interrupt in netconsole mode 

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>
This commit is contained in:
Nithin Nayak Sujir 2013-01-14 17:10:59 +00:00 committed by David S. Miller
parent 47fb3a26e2
commit 9c13cb8bb4
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/broadcom/tg3.c
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@ -6950,6 +6950,9 @@ 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]);
}
@ -16367,6 +16370,7 @@ static int 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;