1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 67d9dc5b351b..06e1ecb4919f 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -200,10 +200,10 @@ static int __devinit at91_i2c_probe(struct platform_device *pdev)
         if (!res)
                 return -ENXIO;
 
-        if (!request_mem_region(res->start, res->end - res->start + 1, "at91_i2c"))
+        if (!request_mem_region(res->start, resource_size(res), "at91_i2c"))
                 return -EBUSY;
 
-        twi_base = ioremap(res->start, res->end - res->start + 1);
+        twi_base = ioremap(res->start, resource_size(res));
         if (!twi_base) {
                 rc = -ENOMEM;
                 goto fail0;
@@ -252,7 +252,7 @@ fail2:
 fail1:
         iounmap(twi_base);
 fail0:
-        release_mem_region(res->start, res->end - res->start + 1);
+        release_mem_region(res->start, resource_size(res));
 
         return rc;
 }
@@ -268,7 +268,7 @@ static int __devexit at91_i2c_remove(struct platform_device *pdev)
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         iounmap(twi_base);
-        release_mem_region(res->start, res->end - res->start + 1);
+        release_mem_region(res->start, resource_size(res));
 
         clk_disable(twi_clk);           /* disable peripheral clock */
         clk_put(twi_clk);