cpmac: use resource_size()

The original code is off by one because we should start counting at
zero.  So the size of the resource is end - start + 1.  I switched it to
use resource_size() to do the calculation.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/net/cpmac.c b/drivers/net/cpmac.c
index 3c58db595285..1756d28250d4 100644
--- a/drivers/net/cpmac.c
+++ b/drivers/net/cpmac.c
@@ -964,7 +964,7 @@ static int cpmac_open(struct net_device *dev)
         struct sk_buff *skb;
 
         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
-        if (!request_mem_region(mem->start, mem->end - mem->start, dev->name)) {
+        if (!request_mem_region(mem->start, resource_size(mem), dev->name)) {
                 if (netif_msg_drv(priv))
                         printk(KERN_ERR "%s: failed to request registers\n",
                                dev->name);
@@ -972,7 +972,7 @@ static int cpmac_open(struct net_device *dev)
                 goto fail_reserve;
         }
 
-        priv->regs = ioremap(mem->start, mem->end - mem->start);
+        priv->regs = ioremap(mem->start, resource_size(mem));
         if (!priv->regs) {
                 if (netif_msg_drv(priv))
                         printk(KERN_ERR "%s: failed to remap registers\n",
@@ -1049,7 +1049,7 @@ fail_alloc:
         iounmap(priv->regs);
 
 fail_remap:
-        release_mem_region(mem->start, mem->end - mem->start);
+        release_mem_region(mem->start, resource_size(mem));
 
 fail_reserve:
         return res;
@@ -1077,7 +1077,7 @@ static int cpmac_stop(struct net_device *dev)
         free_irq(dev->irq, dev);
         iounmap(priv->regs);
         mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
-        release_mem_region(mem->start, mem->end - mem->start);
+        release_mem_region(mem->start, resource_size(mem));
         priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
         for (i = 0; i < priv->ring_size; i++) {
                 if (priv->rx_head[i].skb) {