V4L/DVB (5505): Fix Kernel Bugzilla #8301: spinlock fix for flexcop-pci

If you modprobe the b2c2-flexcop-pci module you got a hardlock of your system.
This is due the usage of spin_lock before spin_lock_init is called.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/b2c2/flexcop-pci.c

@@ -127,10 +127,11 @@ static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
 {
 	struct flexcop_pci *fc_pci = dev_id;
 	struct flexcop_device *fc = fc_pci->fc_dev;
+	unsigned long flags;
 	flexcop_ibi_value v;
 	irqreturn_t ret = IRQ_HANDLED;
 
-	spin_lock_irq(&fc_pci->irq_lock);
+	spin_lock_irqsave(&fc_pci->irq_lock,flags);
 
 	v = fc->read_ibi_reg(fc,irq_20c);
 
@@ -194,7 +195,7 @@ static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
 		ret = IRQ_NONE;
 	}
 
-	spin_unlock_irq(&fc_pci->irq_lock);
+	spin_unlock_irqrestore(&fc_pci->irq_lock,flags);
 
 	return ret;
 }
@@ -293,12 +294,12 @@ static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 	}
 
 	pci_set_drvdata(fc_pci->pdev, fc_pci);
-
+	spin_lock_init(&fc_pci->irq_lock);
 	if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
 					IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
 		goto err_pci_iounmap;
 
-	spin_lock_init(&fc_pci->irq_lock);
+
 
 	fc_pci->init_state |= FC_PCI_INIT;
 	return ret;