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tulip: fix crash on iface up with shirq debug 

Tulip is currently doing request_irq before it has done its
initialization. This is usually not a problem because it hasn't
enable interrupts yet, but with DEBUG_SHIRQ on, we call the irq handler
when registering the interrupt as a sanity check.

This can result in a NULL ptr dereference, so call tulip_init_ring
before request_irq, and add a free_ring function to do the freeing
now shared with tulip_close.

Tested with a shell loop running ifup, ifdown in a loop a few hundred
times with DEBUG_SHIRQ on.

Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kyle McMartin 2009-03-18 18:49:01 -07:00 committed by David S. Miller
parent 4783256ef9
commit 69145635d4
1 changed files with 29 additions and 16 deletions
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45
drivers/net/tulip/tulip_core.c
View File

@ -255,6 +255,7 @@ const char tulip_media_cap[32] =
static void tulip_tx_timeout(struct net_device *dev);
static void tulip_init_ring(struct net_device *dev);
static void tulip_free_ring(struct net_device *dev);
static int tulip_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int tulip_open(struct net_device *dev);
static int tulip_close(struct net_device *dev);
@ -502,16 +503,21 @@ tulip_open(struct net_device *dev)
{
int retval;
if ((retval = request_irq(dev->irq, &tulip_interrupt, IRQF_SHARED, dev->name, dev)))
return retval;
tulip_init_ring (dev);
retval = request_irq(dev->irq, &tulip_interrupt, IRQF_SHARED, dev->name, dev);
if (retval)
goto free_ring;
tulip_up (dev);
netif_start_queue (dev);
return 0;
free_ring:
tulip_free_ring (dev);
return retval;
}
@ -768,23 +774,11 @@ static void tulip_down (struct net_device *dev)
tulip_set_power_state (tp, 0, 1);
}
static int tulip_close (struct net_device *dev)
static void tulip_free_ring (struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->base_addr;
int i;
netif_stop_queue (dev);
tulip_down (dev);
if (tulip_debug > 1)
printk (KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
dev->name, ioread32 (ioaddr + CSR5));
free_irq (dev->irq, dev);
/* Free all the skbuffs in the Rx queue. */
for (i = 0; i < RX_RING_SIZE; i++) {
struct sk_buff *skb = tp->rx_buffers[i].skb;
@ -803,6 +797,7 @@ static int tulip_close (struct net_device *dev)
dev_kfree_skb (skb);
}
}
for (i = 0; i < TX_RING_SIZE; i++) {
struct sk_buff *skb = tp->tx_buffers[i].skb;
@ -814,6 +809,24 @@ static int tulip_close (struct net_device *dev)
tp->tx_buffers[i].skb = NULL;
tp->tx_buffers[i].mapping = 0;
}
}
static int tulip_close (struct net_device *dev)
{
struct tulip_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->base_addr;
netif_stop_queue (dev);
tulip_down (dev);
if (tulip_debug > 1)
printk (KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
dev->name, ioread32 (ioaddr + CSR5));
free_irq (dev->irq, dev);
tulip_free_ring (dev);
return 0;
}