Revert "rt2x00: handle spurious pci interrupts"

This reverts commit 23085d57.

The original patch was a misguided attempt to improve performance on
some hardware that is apparently prone to spurious interrupt generation.
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2400pci.c

@@ -1380,7 +1380,7 @@ static irqreturn_t rt2400pci_interrupt(int irq, void *dev_instance)
 	rt2x00pci_register_write(rt2x00dev, CSR7, reg);
 
 	if (!reg)
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 		return IRQ_HANDLED;

drivers/net/wireless/rt2x00/rt2500pci.c

@@ -1512,7 +1512,7 @@ static irqreturn_t rt2500pci_interrupt(int irq, void *dev_instance)
 	rt2x00pci_register_write(rt2x00dev, CSR7, reg);
 
 	if (!reg)
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 		return IRQ_HANDLED;

drivers/net/wireless/rt2x00/rt61pci.c

@@ -2337,7 +2337,7 @@ static irqreturn_t rt61pci_interrupt(int irq, void *dev_instance)
 	rt2x00pci_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
 
 	if (!reg && !reg_mcu)
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 		return IRQ_HANDLED;