Sysace: Don't enable IRQ until after interrupt handler is registered

The previous patch to move the interrupt handler registration moved it
below enabling interrupts which could be a problem if the device is on
a shared interrupt line.  This patch fixes the order.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/block/xsysace.c

@@ -1005,11 +1005,6 @@ static int __devinit ace_setup(struct ace_device *ace)
 	ace_out(ace, ACE_CTRL, ACE_CTRL_FORCECFGMODE |
 		ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ);
 
-	/* Enable interrupts */
-	val = ace_in(ace, ACE_CTRL);
-	val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ;
-	ace_out(ace, ACE_CTRL, val);
-
 	/* Now we can hook up the irq handler */
 	if (ace->irq != NO_IRQ) {
 		rc = request_irq(ace->irq, ace_interrupt, 0, "systemace", ace);
@@ -1020,6 +1015,11 @@ static int __devinit ace_setup(struct ace_device *ace)
 		}
 	}
 
+	/* Enable interrupts */
+	val = ace_in(ace, ACE_CTRL);
+	val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ;
+	ace_out(ace, ACE_CTRL, val);
+
 	/* Print the identification */
 	dev_info(ace->dev, "Xilinx SystemACE revision %i.%i.%i\n",
 		 (version >> 12) & 0xf, (version >> 8) & 0x0f, version & 0xff);