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e1000: Avoid unhandled IRQ 

If hardware asserted an interrupt and driver is down,
then there is nothing to do so return IRQ_HANDLED
instead of IRQ_NONE. Returning IRQ_NONE in above
situation causes screaming IRQ on virtual machines.

CC: Andy Gospodarek <gospo@redhat.com>
Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jesse Brandeburg 2011-01-13 07:48:13 +00:00 committed by Jeff Kirsher
parent 1949e084bf
commit 4c11b8adbc
1 changed files with 9 additions and 1 deletions
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10
drivers/net/e1000/e1000_main.c
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@ -3478,9 +3478,17 @@ static irqreturn_t e1000_intr(int irq, void *data)
struct e1000_hw *hw = &adapter->hw; struct e1000_hw *hw = &adapter->hw;
u32 icr = er32(ICR); u32 icr = er32(ICR);
if (unlikely((!icr) || test_bit(__E1000_DOWN, &adapter->flags))) if (unlikely((!icr)))
return IRQ_NONE; /* Not our interrupt */ return IRQ_NONE; /* Not our interrupt */
/*
* we might have caused the interrupt, but the above
* read cleared it, and just in case the driver is
* down there is nothing to do so return handled
*/
if (unlikely(test_bit(__E1000_DOWN, &adapter->flags)))
return IRQ_HANDLED;
if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) { if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
hw->get_link_status = 1; hw->get_link_status = 1;
/* guard against interrupt when we're going down */ /* guard against interrupt when we're going down */