3c59x: Fix shared IRQ handling

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>

diff --git a/drivers/net/ethernet/3com/3c59x.c b/drivers/net/ethernet/3com/3c59x.c
index 41095eb..2d1ce3c 100644 (file)
--- a/drivers/net/ethernet/3com/3c59x.c
+++ b/drivers/net/ethernet/3com/3c59x.c
@@ -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)