omap: rng: Use resource_size instead of manual calculation

Use the resource_size function instead of manually calculating the
resource size. This reduces the chance of introducing off-by-one-errors.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 00dd3de..06aad08 100644 (file)
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -116,7 +116,7 @@ static int __devinit omap_rng_probe(struct platform_device *pdev)
        if (!res)
                return -ENOENT;
 
-       mem = request_mem_region(res->start, res->end - res->start + 1,
+       mem = request_mem_region(res->start, resource_size(res),
                                 pdev->name);
        if (mem == NULL) {
                ret = -EBUSY;
@@ -124,7 +124,7 @@ static int __devinit omap_rng_probe(struct platform_device *pdev)
        }
 
        dev_set_drvdata(&pdev->dev, mem);
-       rng_base = ioremap(res->start, res->end - res->start + 1);
+       rng_base = ioremap(res->start, resource_size(res));
        if (!rng_base) {
                ret = -ENOMEM;
                goto err_ioremap;