mfd: Use resource_size() in sm501

The requested memory region is smaller than the actual ioremap().
Use resource_size() to get the correct size.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/sm501.c

@@ -1430,7 +1430,7 @@ static int __devinit sm501_plat_probe(struct platform_device *dev)
 	}
 
 	sm->regs_claim = request_mem_region(sm->io_res->start,
-					    0x100, "sm501");
+					    resource_size(sm->io_res), "sm501");
 
 	if (sm->regs_claim == NULL) {
 		dev_err(&dev->dev, "cannot claim registers\n");
@@ -1440,8 +1440,7 @@ static int __devinit sm501_plat_probe(struct platform_device *dev)
 
 	platform_set_drvdata(dev, sm);
 
-	sm->regs = ioremap(sm->io_res->start,
-			   (sm->io_res->end - sm->io_res->start) - 1);
+	sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
 
 	if (sm->regs == NULL) {
 		dev_err(&dev->dev, "cannot remap registers\n");
@@ -1645,7 +1644,7 @@ static int __devinit sm501_pci_probe(struct pci_dev *dev,
 	sm->mem_res = &dev->resource[0];
 
 	sm->regs_claim = request_mem_region(sm->io_res->start,
-					    0x100, "sm501");
+					    resource_size(sm->io_res), "sm501");
 	if (sm->regs_claim == NULL) {
 		dev_err(&dev->dev, "cannot claim registers\n");
 		err= -EBUSY;