atp870u: Request IRQ later, remove weird locking

Allocate IRQ later during probe to avoid code duplication and also
remove the need for weird locking in _probe.
(It was probably there to prevent race with the IRQ handler?)
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Reviewed-by: NHannes Reinicke <hare@suse.de>
Acked-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/atp870u.c

@@ -1253,7 +1253,6 @@ static void atp_set_host_id(struct atp_unit *atp, u8 c, u8 host_id)
 static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	unsigned char k, m, c;
-	unsigned long flags;
 	unsigned int error,n;
 	unsigned char host_id;
 	struct Scsi_Host *shpnt = NULL;
@@ -1374,13 +1373,6 @@ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			goto unregister;
 		}
 
-		err = request_irq(shpnt->irq, atp870u_intr_handle, IRQF_SHARED, "atp880i", shpnt);
-		if (err) {
-			printk(KERN_ERR "Unable to allocate IRQ%d for Acard controller.\n", shpnt->irq);
-			goto free_tables;
-		}
-
-		spin_lock_irqsave(shpnt->host_lock, flags);
 		k = atp_readb_base(atpdev, 0x38) & 0x80;
 		atp_writeb_base(atpdev, 0x38, k);
 		atp_writeb_base(atpdev, 0x3b, 0x20);
@@ -1412,17 +1404,6 @@ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			goto unregister;
 		}
 			
-#ifdef ED_DBGP		
-	printk("request_irq() shpnt %p hostdata %p\n", shpnt, atpdev);
-#endif	        
-		err = request_irq(shpnt->irq, atp870u_intr_handle, IRQF_SHARED, "atp870u", shpnt);
-		if (err) {
-				printk(KERN_ERR "Unable to allocate IRQ for Acard controller.\n");
-			goto free_tables;
-		}
-		
-		spin_lock_irqsave(shpnt->host_lock, flags);        					
-        			
 		c = atp_readb_base(atpdev, 0x29);
 		atp_writeb_base(atpdev, 0x29, c | 0x04);
         	
@@ -1558,13 +1539,6 @@ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			goto unregister;
 		}
 
-		err = request_irq(shpnt->irq, atp870u_intr_handle, IRQF_SHARED, "atp870i", shpnt);
-		if (err) {
-			printk(KERN_ERR "Unable to allocate IRQ%d for Acard controller.\n", shpnt->irq);
-			goto free_tables;
-		}
-
-		spin_lock_irqsave(shpnt->host_lock, flags);
 		if (pdev->revision > 0x07)	/* check if atp876 chip then enable terminator */
 			atp_writeb_base(atpdev, 0x3e, 0x00);
  
@@ -1586,15 +1560,18 @@ static int atp870u_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		shpnt->this_id = host_id;
 
 	} 
-		spin_unlock_irqrestore(shpnt->host_lock, flags);
-		err = scsi_add_host(shpnt, &pdev->dev);
-		if (err)
-			goto scsi_add_fail;
-		scsi_scan_host(shpnt);
-#ifdef ED_DBGP			
-		printk("atp870u_prob : exit\n");
-#endif		
-		return 0;
+	err = request_irq(shpnt->irq, atp870u_intr_handle, IRQF_SHARED, "atp870u", shpnt);
+	if (err) {
+		dev_err(&pdev->dev, "Unable to allocate IRQ %d.\n", shpnt->irq);
+		goto free_tables;
+	}
+
+	err = scsi_add_host(shpnt, &pdev->dev);
+	if (err)
+		goto scsi_add_fail;
+	scsi_scan_host(shpnt);
+
+	return 0;
 
 scsi_add_fail:
 	free_irq(shpnt->irq, shpnt);