edac: fix resource size calculation

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: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/edac/cpc925_edac.c b/drivers/edac/cpc925_edac.c
index 8c54196b5aba..3d50274f1348 100644
--- a/drivers/edac/cpc925_edac.c
+++ b/drivers/edac/cpc925_edac.c
@@ -885,14 +885,14 @@ static int __devinit cpc925_probe(struct platform_device *pdev)
 
         if (!devm_request_mem_region(&pdev->dev,
                                      r->start,
-                                     r->end - r->start + 1,
+                                     resource_size(r),
                                      pdev->name)) {
                 cpc925_printk(KERN_ERR, "Unable to request mem region\n");
                 res = -EBUSY;
                 goto err1;
         }
 
-        vbase = devm_ioremap(&pdev->dev, r->start, r->end - r->start + 1);
+        vbase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
         if (!vbase) {
                 cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
                 res = -ENOMEM;
@@ -953,7 +953,7 @@ err3:
         cpc925_mc_exit(mci);
         edac_mc_free(mci);
 err2:
-        devm_release_mem_region(&pdev->dev, r->start, r->end-r->start+1);
+        devm_release_mem_region(&pdev->dev, r->start, resource_size(r));
 err1:
         devres_release_group(&pdev->dev, cpc925_probe);
 out: