drivers/net/smsc911x.c: Fix resource size off by 1 error

The call resource_size(res) returns res->end - res->start + 1 and thus the
second change is semantics-preserving.  res_size is then used as the second
argument of a call to request_mem_region, and the memory allocated by this
call appears to be the same as what is released in the two calls to
release_mem_region.  So the size argument for those calls should be
resource_size(size) as well.  Alternatively, in the second call to
release_mem_region, the second argument could be res_size, as that variable
has already been initialized at the point of this call.

The problem was found using the following semantic patch:
(http://www.emn.fr/x-info/coccinelle/)

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

- (res->end - res->start) + 1
+ resource_size(res)

@@
struct resource *res;
@@

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

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index b60639b..66067f9 100644 (file)
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -1938,7 +1938,7 @@ static int __devexit smsc911x_drv_remove(struct platform_device *pdev)
        if (!res)
                res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
-       release_mem_region(res->start, res->end - res->start);
+       release_mem_region(res->start, resource_size(res));
 
        iounmap(pdata->ioaddr);
 
@@ -1976,7 +1976,7 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
                retval = -ENODEV;
                goto out_0;
        }
-       res_size = res->end - res->start + 1;
+       res_size = resource_size(res);
 
        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
        if (!irq_res) {
@@ -2104,7 +2104,7 @@ out_unmap_io_3:
 out_free_netdev_2:
        free_netdev(dev);
 out_release_io_1:
-       release_mem_region(res->start, res->end - res->start);
+       release_mem_region(res->start, resource_size(res));
 out_0:
        return retval;
 }