USB: isp1760: Use resource_size

Use the resource_size function instead of manually calculating the
resource size.  This reduces the chance of introducing off-by-one
errors.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/isp1760-if.c b/drivers/usb/host/isp1760-if.c
index 42a0946..8f0259e 100644 (file)
--- a/drivers/usb/host/isp1760-if.c
+++ b/drivers/usb/host/isp1760-if.c
@@ -36,7 +36,7 @@ static int of_isp1760_probe(struct of_device *dev,
        struct resource memory;
        struct of_irq oirq;
        int virq;
-       u64 res_len;
+       resource_size_t res_len;
        int ret;
        const unsigned int *prop;
        unsigned int devflags = 0;
@@ -45,13 +45,12 @@ static int of_isp1760_probe(struct of_device *dev,
        if (ret)
                return -ENXIO;
 
-       res = request_mem_region(memory.start, memory.end - memory.start + 1,
-                       dev_name(&dev->dev));
+       res_len = resource_size(&memory);
+
+       res = request_mem_region(memory.start, res_len, dev_name(&dev->dev));
        if (!res)
                return -EBUSY;
 
-       res_len = memory.end - memory.start + 1;
-
        if (of_irq_map_one(dp, 0, &oirq)) {
                ret = -ENODEV;
                goto release_reg;
@@ -92,7 +91,7 @@ static int of_isp1760_probe(struct of_device *dev,
        return ret;
 
 release_reg:
-       release_mem_region(memory.start, memory.end - memory.start + 1);
+       release_mem_region(memory.start, res_len);
        return ret;
 }