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[PATCH] skge: irq lock race

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The driver needs to access the IRQ status inside of lock to avoid
races with other places changing IRQ mask etc. This may be related
to some of the SMP bugs reported against skge in kernel bugzilla.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2006-09-01 15:53:48 -07:00 committed by Jeff Garzik
parent c54f9765da
commit 29365c9009
1 changed files with 6 additions and 3 deletions
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9
drivers/net/skge.c
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@ -2891,13 +2891,15 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct skge_hw *hw = dev_id;
u32 status;
int handled = 0;
spin_lock(&hw->hw_lock);
/* Reading this register masks IRQ */
status = skge_read32(hw, B0_SP_ISRC);
if (status == 0)
return IRQ_NONE;
goto out;
spin_lock(&hw->hw_lock);
handled = 1;
status &= hw->intr_mask;
if (status & IS_EXT_REG) {
hw->intr_mask &= ~IS_EXT_REG;
@ -2959,9 +2961,10 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
skge_write32(hw, B0_IMSK, hw->intr_mask);
skge_read32(hw, B0_IMSK);
out:
spin_unlock(&hw->hw_lock);
return IRQ_HANDLED;
return IRQ_RETVAL(handled);
}
#ifdef CONFIG_NET_POLL_CONTROLLER