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3c59x: Fix shared IRQ handling

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As its first order of business, boomerang_interrupt() checks whether
the device really has any pending interrupts. If it does not,
it does nothing and returns, but it still returns IRQ_HANDLED.

This is wrong: interrupt was not handled, IRQ handlers of other
devices sharing this IRQ line need to be called.

vortex_interrupt() has it right: it returns IRQ_NONE in this case
via IRQ_RETVAL(0).

Do the same in boomerang_interrupt().

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: David S. Miller <davem@davemloft.net>
CC: linux-kernel@vger.kernel.org
CC: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denys Vlasenko 2015-07-07 20:48:55 +02:00 committed by David S. Miller
parent 0769636cb5
commit 4eed4d8ff9
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/3com/3c59x.c
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@ -2382,6 +2382,7 @@ boomerang_interrupt(int irq, void *dev_id)
void __iomem *ioaddr;
int status;
int work_done = max_interrupt_work;
int handled = 0;
ioaddr = vp->ioaddr;
@ -2400,6 +2401,7 @@ boomerang_interrupt(int irq, void *dev_id)
if ((status & IntLatch) == 0)
goto handler_exit; /* No interrupt: shared IRQs can cause this */
handled = 1;
if (status == 0xffff) { /* h/w no longer present (hotplug)? */
if (vortex_debug > 1)
@ -2501,7 +2503,7 @@ boomerang_interrupt(int irq, void *dev_id)
handler_exit:
vp->handling_irq = 0;
spin_unlock(&vp->lock);
return IRQ_HANDLED;
return IRQ_RETVAL(handled);
}
static int vortex_rx(struct net_device *dev)