USB: gadget: imx_udc: 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/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c
index c52a681..01ee0b9 100644 (file)
--- a/drivers/usb/gadget/imx_udc.c
+++ b/drivers/usb/gadget/imx_udc.c
@@ -1402,7 +1402,8 @@ static int __init imx_udc_probe(struct platform_device *pdev)
        struct clk *clk;
        void __iomem *base;
        int ret = 0;
-       int i, res_size;
+       int i;
+       resource_size_t res_size;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
@@ -1416,7 +1417,7 @@ static int __init imx_udc_probe(struct platform_device *pdev)
                return -ENODEV;
        }
 
-       res_size = res->end - res->start + 1;
+       res_size = resource_size(res);
        if (!request_mem_region(res->start, res_size, res->name)) {
                dev_err(&pdev->dev, "can't allocate %d bytes at %d address\n",
                        res_size, res->start);
@@ -1527,8 +1528,7 @@ static int __exit imx_udc_remove(struct platform_device *pdev)
        clk_disable(imx_usb->clk);
        iounmap(imx_usb->base);
 
-       release_mem_region(imx_usb->res->start,
-               imx_usb->res->end - imx_usb->res->start + 1);
+       release_mem_region(imx_usb->res->start, resource_size(imx_usb->res));
 
        if (pdata->exit)
                pdata->exit(&pdev->dev);