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skge: protect interrupt mask 

There is a race between updating the irq mask and setting it
which can be triggered on SMP with a bad cable.
Similar patch from Ingo Molnar and Thomas Gleixner

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
This commit is contained in:
Stephen Hemminger 2006-02-22 10:28:35 -08:00 committed by Francois Romieu
parent 0781191cf6
commit 80dd857dac
2 changed files with 15 additions and 7 deletions
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21
drivers/net/skge.c
View File

@ -2185,8 +2185,10 @@ static int skge_up(struct net_device *dev)
skge->tx_avail = skge->tx_ring.count - 1;
/* Enable IRQ from port */
spin_lock_irq(&hw->hw_lock);
hw->intr_mask |= portirqmask[port];
skge_write32(hw, B0_IMSK, hw->intr_mask);
spin_unlock_irq(&hw->hw_lock);
/* Initialize MAC */
spin_lock_bh(&hw->phy_lock);
@ -2244,8 +2246,10 @@ static int skge_down(struct net_device *dev)
else
yukon_stop(skge);
spin_lock_irq(&hw->hw_lock);
hw->intr_mask &= ~portirqmask[skge->port];
skge_write32(hw, B0_IMSK, hw->intr_mask);
spin_unlock_irq(&hw->hw_lock);
/* Stop transmitter */
skge_write8(hw, Q_ADDR(txqaddr[port], Q_CSR), CSR_STOP);
@ -2701,10 +2705,11 @@ static int skge_poll(struct net_device *dev, int *budget)
if (work_done >= to_do)
return 1; /* not done */
netif_rx_complete(dev);
hw->intr_mask |= portirqmask[skge->port];
skge_write32(hw, B0_IMSK, hw->intr_mask);
skge_read32(hw, B0_IMSK);
spin_lock_irq(&hw->hw_lock);
__netif_rx_complete(dev);
hw->intr_mask |= portirqmask[skge->port];
skge_write32(hw, B0_IMSK, hw->intr_mask);
spin_unlock_irq(&hw->hw_lock);
return 0;
}
@ -2864,10 +2869,10 @@ static void skge_extirq(unsigned long data)
}
spin_unlock(&hw->phy_lock);
local_irq_disable();
spin_lock_irq(&hw->hw_lock);
hw->intr_mask |= IS_EXT_REG;
skge_write32(hw, B0_IMSK, hw->intr_mask);
local_irq_enable();
spin_unlock_irq(&hw->hw_lock);
}
static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
@ -2878,7 +2883,7 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
if (status == 0 || status == ~0) /* hotplug or shared irq */
return IRQ_NONE;
status &= hw->intr_mask;
spin_lock(&hw->hw_lock);
if (status & IS_R1_F) {
skge_write8(hw, Q_ADDR(Q_R1, Q_CSR), CSR_IRQ_CL_F);
hw->intr_mask &= ~IS_R1_F;
@ -2930,6 +2935,7 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
}
skge_write32(hw, B0_IMSK, hw->intr_mask);
spin_unlock(&hw->hw_lock);
return IRQ_HANDLED;
}
@ -3298,6 +3304,7 @@ static int __devinit skge_probe(struct pci_dev *pdev,
hw->pdev = pdev;
spin_lock_init(&hw->phy_lock);
spin_lock_init(&hw->hw_lock);
tasklet_init(&hw->ext_tasklet, skge_extirq, (unsigned long) hw);
hw->regs = ioremap_nocache(pci_resource_start(pdev, 0), 0x4000);

1
drivers/net/skge.h
View File

@ -2402,6 +2402,7 @@ struct skge_hw {
struct tasklet_struct ext_tasklet;
spinlock_t phy_lock;
spinlock_t hw_lock;
};
enum {