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path: root/drivers/net/3c59x.c
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Diffstat (limited to 'drivers/net/3c59x.c')
-rw-r--r--drivers/net/3c59x.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 7a01588fb6f..e31a6d1919c 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -633,7 +633,8 @@ struct vortex_private {
open:1,
medialock:1,
must_free_region:1, /* Flag: if zero, Cardbus owns the I/O region */
- large_frames:1; /* accept large frames */
+ large_frames:1, /* accept large frames */
+ handling_irq:1; /* private in_irq indicator */
int drv_flags;
u16 status_enable;
u16 intr_enable;
@@ -646,7 +647,7 @@ struct vortex_private {
u16 io_size; /* Size of PCI region (for release_region) */
/* Serialises access to hardware other than MII and variables below.
- * The lock hierarchy is rtnl_lock > lock > mii_lock > window_lock. */
+ * The lock hierarchy is rtnl_lock > {lock, mii_lock} > window_lock. */
spinlock_t lock;
spinlock_t mii_lock; /* Serialises access to MII */
@@ -1993,10 +1994,9 @@ vortex_error(struct net_device *dev, int status)
}
}
- if (status & RxEarly) { /* Rx early is unused. */
- vortex_rx(dev);
+ if (status & RxEarly) /* Rx early is unused. */
iowrite16(AckIntr | RxEarly, ioaddr + EL3_CMD);
- }
+
if (status & StatsFull) { /* Empty statistics. */
static int DoneDidThat;
if (vortex_debug > 4)
@@ -2133,6 +2133,15 @@ boomerang_start_xmit(struct sk_buff *skb, struct net_device *dev)
dev->name, vp->cur_tx);
}
+ /*
+ * We can't allow a recursion from our interrupt handler back into the
+ * tx routine, as they take the same spin lock, and that causes
+ * deadlock. Just return NETDEV_TX_BUSY and let the stack try again in
+ * a bit
+ */
+ if (vp->handling_irq)
+ return NETDEV_TX_BUSY;
+
if (vp->cur_tx - vp->dirty_tx >= TX_RING_SIZE) {
if (vortex_debug > 0)
pr_warning("%s: BUG! Tx Ring full, refusing to send buffer.\n",
@@ -2288,7 +2297,12 @@ vortex_interrupt(int irq, void *dev_id)
if (status & (HostError | RxEarly | StatsFull | TxComplete | IntReq)) {
if (status == 0xffff)
break;
+ if (status & RxEarly)
+ vortex_rx(dev);
+ spin_unlock(&vp->window_lock);
vortex_error(dev, status);
+ spin_lock(&vp->window_lock);
+ window_set(vp, 7);
}
if (--work_done < 0) {
@@ -2335,11 +2349,13 @@ boomerang_interrupt(int irq, void *dev_id)
ioaddr = vp->ioaddr;
+
/*
* It seems dopey to put the spinlock this early, but we could race against vortex_tx_timeout
* and boomerang_start_xmit
*/
spin_lock(&vp->lock);
+ vp->handling_irq = 1;
status = ioread16(ioaddr + EL3_STATUS);
@@ -2447,6 +2463,7 @@ boomerang_interrupt(int irq, void *dev_id)
pr_debug("%s: exiting interrupt, status %4.4x.\n",
dev->name, status);
handler_exit:
+ vp->handling_irq = 0;
spin_unlock(&vp->lock);
return IRQ_HANDLED;
}
@@ -2971,7 +2988,6 @@ static int vortex_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
int err;
struct vortex_private *vp = netdev_priv(dev);
- unsigned long flags;
pci_power_t state = 0;
if(VORTEX_PCI(vp))
@@ -2981,9 +2997,7 @@ static int vortex_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
if(state != 0)
pci_set_power_state(VORTEX_PCI(vp), PCI_D0);
- spin_lock_irqsave(&vp->lock, flags);
err = generic_mii_ioctl(&vp->mii, if_mii(rq), cmd, NULL);
- spin_unlock_irqrestore(&vp->lock, flags);
if(state != 0)
pci_set_power_state(VORTEX_PCI(vp), state);