staging: vt6655: Fix Warning on boot handle_irq_event_percpu.

WARNING: CPU: 0 PID: 929 at /home/apw/COD/linux/kernel/irq/handle.c:147 handle_irq_event_percpu+0x1d1/0x1e0()
irq 17 handler device_intr+0x0/0xa80 [vt6655_stage] enabled interrupts

Using spin_lock_irqsave appears to fix this.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/device_main.c

@@ -2318,6 +2318,7 @@ static  irqreturn_t  device_intr(int irq,  void *dev_instance) {
 	int             handled = 0;
 	unsigned char byData = 0;
 	int             ii = 0;
+	unsigned long flags;
 
 	MACvReadISR(pDevice->PortOffset, &pDevice->dwIsr);
 
@@ -2331,7 +2332,8 @@ static  irqreturn_t  device_intr(int irq,  void *dev_instance) {
 
 	handled = 1;
 	MACvIntDisable(pDevice->PortOffset);
-	spin_lock_irq(&pDevice->lock);
+
+	spin_lock_irqsave(&pDevice->lock, flags);
 
 	//Make sure current page is 0
 	VNSvInPortB(pDevice->PortOffset + MAC_REG_PAGE1SEL, &byOrgPageSel);
@@ -2560,7 +2562,8 @@ static  irqreturn_t  device_intr(int irq,  void *dev_instance) {
 	if (byOrgPageSel == 1)
 		MACvSelectPage1(pDevice->PortOffset);
 
-	spin_unlock_irq(&pDevice->lock);
+	spin_unlock_irqrestore(&pDevice->lock, flags);
+
 	MACvIntEnable(pDevice->PortOffset, IMR_MASK_VALUE);
 
 	return IRQ_RETVAL(handled);