input: Use request_region() instead of check_region() in ns558.c

       it's both safer and correct.

drivers/input/gameport/ns558.c

@@ -77,7 +77,7 @@ static void ns558_isa_probe(int io)
  * No one should be using this address.
  */
 
-	if (check_region(io, 1))
+	if (!request_region(io, 1, "ns558-isa"))
 		return;
 
 /*
@@ -89,7 +89,8 @@ static void ns558_isa_probe(int io)
 	outb(~c & ~3, io);
 	if (~(u = v = inb(io)) & 3) {
 		outb(c, io);
-		return;
+		i = 0;
+		goto out;
 	}
 /*
  * After a trigger, there must be at least some bits changing.
@@ -99,7 +100,8 @@ static void ns558_isa_probe(int io)
 
 	if (u == v) {
 		outb(c, io);
-		return;
+		i = 0;
+		goto out;
 	}
 	wait_ms(3);
 /*
@@ -110,7 +112,8 @@ static void ns558_isa_probe(int io)
 	for (i = 0; i < 1000; i++)
 		if ((u ^ inb(io)) & 0xf) {
 			outb(c, io);
-			return;
+			i = 0;
+			goto out;
 		}
 /* 
  * And now find the number of mirrors of the port.
@@ -118,7 +121,9 @@ static void ns558_isa_probe(int io)
 
 	for (i = 1; i < 5; i++) {
 
-		if (check_region(io & (-1 << i), (1 << i)))	/* Don't disturb anyone */
+		release_region(io & (-1 << (i-1)), (1 << (i-1)));
+
+		if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))	/* Don't disturb anyone */
 			break;
 
 		outb(0xff, io & (-1 << i));
@@ -126,15 +131,22 @@ static void ns558_isa_probe(int io)
 			if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;
 		wait_ms(3);
 
-		if (b > 300)					/* We allow 30% difference */
+		if (b > 300) {					/* We allow 30% difference */
+			release_region(io & (-1 << i), (1 << i));
 			break;
 		}
+	}
 
 	i--;
 
+	if (i != 4) {
+		if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
+			return;
+	}
+
 	if (!(port = kmalloc(sizeof(struct ns558), GFP_KERNEL))) {
 		printk(KERN_ERR "ns558: Memory allocation failed.\n");
-		return;
+		goto out;
 	}
 	memset(port, 0, sizeof(struct ns558));
 
@@ -148,8 +160,6 @@ static void ns558_isa_probe(int io)
 	sprintf(port->phys, "isa%04x/gameport0", io & (-1 << i));
 	sprintf(port->name, "NS558 ISA");
 
-	request_region(io & (-1 << i), (1 << i), "ns558-isa");
-
 	gameport_register_port(&port->gameport);
 
 	printk(KERN_INFO "gameport: NS558 ISA at %#x", port->gameport.io);
@@ -157,6 +167,9 @@ static void ns558_isa_probe(int io)
 	printk(" speed %d kHz\n", port->gameport.speed);
 
 	list_add(&port->node, &ns558_list);
+	return;
+out:
+	release_region(io & (-1 << i), (1 << i));
 }
 
 #ifdef CONFIG_PNP