rapidio: use resource_size()

The size calculation is done incorrectly here because it should include
both the start and end (end - start + 1).  It's easiest to just use
resource_size() which does the right thing.

I was worried there was something non-standard going on because the
printk() subtracts "end - 1", but the rest of the file uses the normal
resource size calculations.  This function is only called from
fsl_rio_setup() in arch/powerpc/sysdev/fsl_rio.c and the calculation
there is also:

	port->iores.start = law_start;
	port->iores.end = law_start + law_size - 1;

So I think this is the correct fix.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Acked-by: Li Yang <leoli@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 68cf0c99138a..7b5080c45569 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1159,11 +1159,11 @@ int __devinit rio_init_mports(void)
 
         list_for_each_entry(port, &rio_mports, node) {
                 if (!request_mem_region(port->iores.start,
-                                        port->iores.end - port->iores.start,
+                                        resource_size(&port->iores),
                                         port->name)) {
                         printk(KERN_ERR
                                "RIO: Error requesting master port region 0x%016llx-0x%016llx\n",
-                               (u64)port->iores.start, (u64)port->iores.end - 1);
+                               (u64)port->iores.start, (u64)port->iores.end);
                         rc = -ENOMEM;
                         goto out;
                 }