arm: mach-u300/gpio: Fix mem_region resource size miscalculations

Convert off-by-1 r->end - r->start to resource_size(r)

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 3 insertions, 4 deletions

diff --git a/arch/arm/mach-u300/gpio.c b/arch/arm/mach-u300/gpio.c
index d92790140fe5..94837a4e146b 100644
--- a/arch/arm/mach-u300/gpio.c
+++ b/arch/arm/mach-u300/gpio.c
@@ -581,8 +581,7 @@ static int __init gpio_probe(struct platform_device *pdev)
         if (!memres)
                 goto err_no_resource;
 
-        if (request_mem_region(memres->start, memres->end - memres->start, "GPIO Controller")
-            == NULL) {
+        if (!request_mem_region(memres->start, resource_size(memres), "GPIO Controller")) {
                 err = -ENODEV;
                 goto err_no_ioregion;
         }
@@ -640,7 +639,7 @@ static int __init gpio_probe(struct platform_device *pdev)
                 free_irq(gpio_ports[i].irq, &gpio_ports[i]);
         iounmap(virtbase);
  err_no_ioremap:
-        release_mem_region(memres->start, memres->end - memres->start);
+        release_mem_region(memres->start, resource_size(memres));
  err_no_ioregion:
  err_no_resource:
         clk_disable(clk);
@@ -660,7 +659,7 @@ static int __exit gpio_remove(struct platform_device *pdev)
         for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++)
                 free_irq(gpio_ports[i].irq, &gpio_ports[i]);
         iounmap(virtbase);
-        release_mem_region(memres->start, memres->end - memres->start);
+        release_mem_region(memres->start, resource_size(memres));
         clk_disable(clk);
         clk_put(clk);
         return 0;