usb: host: ehci-mv: Use devm_ioremap_resource instead of devm_ioremap

Using devm_ioremap_resource() API should actually be preferred over
devm_ioremap(), since the former request the mem region first and then
gives back the ioremap'ed memory pointer.
devm_ioremap_resource() calls request_mem_region(), therby preventing
other drivers to make any overlapping call to the same region.
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-mv.c

@@ -176,11 +176,9 @@ static int mv_ehci_probe(struct platform_device *pdev)
 		goto err_put_hcd;
 	}
 
-	ehci_mv->phy_regs = devm_ioremap(&pdev->dev, r->start,
-					 resource_size(r));
-	if (!ehci_mv->phy_regs) {
-		dev_err(&pdev->dev, "failed to map phy I/O memory\n");
-		retval = -EFAULT;
+	ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(ehci_mv->phy_regs)) {
+		retval = PTR_ERR(ehci_mv->phy_regs);
 		goto err_put_hcd;
 	}
 
@@ -191,11 +189,9 @@ static int mv_ehci_probe(struct platform_device *pdev)
 		goto err_put_hcd;
 	}
 
-	ehci_mv->cap_regs = devm_ioremap(&pdev->dev, r->start,
-					 resource_size(r));
-	if (ehci_mv->cap_regs == NULL) {
-		dev_err(&pdev->dev, "failed to map I/O memory\n");
-		retval = -EFAULT;
+	ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(ehci_mv->cap_regs)) {
+		retval = PTR_ERR(ehci_mv->cap_regs);
 		goto err_put_hcd;
 	}