MIPS: pci: convert to devm_ioremap_resource()

Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.
Signed-off-by: Silviu-Mihai Popescu <silviupopescu1990@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/4986/Acked-by: John Crispin <blogic@openwrt.org>

arch/mips/pci/pci-ar71xx.c

@@ -366,9 +366,9 @@ static int ar71xx_pci_probe(struct platform_device *pdev)
 	if (!res)
 		return -EINVAL;
 
-	apc->cfg_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (!apc->cfg_base)
-		return -ENOMEM;
+	apc->cfg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(apc->cfg_base))
+		return PTR_ERR(apc->cfg_base);
 
 	apc->irq = platform_get_irq(pdev, 0);
 	if (apc->irq < 0)

arch/mips/pci/pci-ar724x.c

@@ -365,25 +365,25 @@ static int ar724x_pci_probe(struct platform_device *pdev)
 	if (!res)
 		return -EINVAL;
 
-	apc->ctrl_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (apc->ctrl_base == NULL)
-		return -EBUSY;
+	apc->ctrl_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(apc->ctrl_base))
+		return PTR_ERR(apc->ctrl_base);
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_base");
 	if (!res)
 		return -EINVAL;
 
-	apc->devcfg_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (!apc->devcfg_base)
-		return -EBUSY;
+	apc->devcfg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(apc->devcfg_base))
+		return PTR_ERR(apc->devcfg_base);
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "crp_base");
 	if (!res)
 		return -EINVAL;
 
-	apc->crp_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (apc->crp_base == NULL)
-		return -EBUSY;
+	apc->crp_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(apc->crp_base))
+		return PTR_ERR(apc->crp_base);
 
 	apc->irq = platform_get_irq(pdev, 0);
 	if (apc->irq < 0)