Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[net-next-2.6.git] / drivers / net / 3c59x.c

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 7a01588fb6fbbdcd2c604691f83eb8894d3e3c2e..e31a6d1919c6c10369df1b205d59ed13026ebeb8 100644 (file)
--- 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);