i2c: Use resource_size

Use the function resource_size, which reduces the chance of introducing
off-by-one errors in calculating the resource size.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
struct resource *res;
@@

- (res->end - res->start) + 1
+ resource_size(res)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 1f3d89c3194a..c89687a10835 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -515,7 +515,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
                 return -ENODEV;
         }
 
-        ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
+        ioarea = request_mem_region(mem->start, resource_size(mem),
                                     pdev->name);
         if (!ioarea) {
                 dev_err(&pdev->dev, "I2C region already claimed\n");
@@ -578,7 +578,7 @@ err_free_mem:
         put_device(&pdev->dev);
         kfree(dev);
 err_release_region:
-        release_mem_region(mem->start, (mem->end - mem->start) + 1);
+        release_mem_region(mem->start, resource_size(mem));
 
         return r;
 }
@@ -601,7 +601,7 @@ static int davinci_i2c_remove(struct platform_device *pdev)
         kfree(dev);
 
         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        release_mem_region(mem->start, (mem->end - mem->start) + 1);
+        release_mem_region(mem->start, resource_size(mem));
         return 0;
 }