firewire: ohci: optimize iso context checks in the interrupt handler

When the isochRx/isochTx bit is clear, we do not need to read the
corresponding iso interrupt event register.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/ohci.c

@@ -1813,23 +1813,29 @@ static irqreturn_t irq_handler(int irq, void *data)
 	if (event & OHCI1394_respTxComplete)
 		tasklet_schedule(&ohci->at_response_ctx.tasklet);
 
+	if (event & OHCI1394_isochRx) {
 		iso_event = reg_read(ohci, OHCI1394_IsoRecvIntEventClear);
 		reg_write(ohci, OHCI1394_IsoRecvIntEventClear, iso_event);
 
 		while (iso_event) {
 			i = ffs(iso_event) - 1;
-		tasklet_schedule(&ohci->ir_context_list[i].context.tasklet);
+			tasklet_schedule(
+				&ohci->ir_context_list[i].context.tasklet);
 			iso_event &= ~(1 << i);
 		}
+	}
 
+	if (event & OHCI1394_isochTx) {
 		iso_event = reg_read(ohci, OHCI1394_IsoXmitIntEventClear);
 		reg_write(ohci, OHCI1394_IsoXmitIntEventClear, iso_event);
 
 		while (iso_event) {
 			i = ffs(iso_event) - 1;
-		tasklet_schedule(&ohci->it_context_list[i].context.tasklet);
+			tasklet_schedule(
+				&ohci->it_context_list[i].context.tasklet);
 			iso_event &= ~(1 << i);
 		}
+	}
 
 	if (unlikely(event & OHCI1394_regAccessFail))
 		fw_error("Register access failure - "