dmaengine: mpc512x: Use resource_size

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>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/mpc512x_dma.c b/drivers/dma/mpc512x_dma.c
index 7a750b9..e41fb8b 100644 (file)
--- a/drivers/dma/mpc512x_dma.c
+++ b/drivers/dma/mpc512x_dma.c
@@ -657,7 +657,7 @@ static int __devinit mpc_dma_probe(struct of_device *op,
        }
 
        regs_start = res.start;
-       regs_size = res.end - res.start + 1;
+       regs_size = resource_size(&res);
 
        if (!devm_request_mem_region(dev, regs_start, regs_size, DRV_NAME)) {
                dev_err(dev, "Error requesting memory region!\n");