1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 0cc5eeff5ee8..dc9ea95c0561 100644
--- a/drivers/mfd/sm501.c
+++ b/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;