MIPS: 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.

devm_ioremap_resource() provides its own error messages so all explicit
error messages can be removed from the failure code paths.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/mips/lantiq/xway/dma.c

@@ -21,6 +21,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 
 #include <lantiq_soc.h>
 #include <xway_dma.h>
@@ -223,8 +224,8 @@ ltq_dma_init(struct platform_device *pdev)
 		panic("Failed to get dma resource");
 
 	/* remap dma register range */
-	ltq_dma_membase = devm_request_and_ioremap(&pdev->dev, res);
-	if (!ltq_dma_membase)
+	ltq_dma_membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(ltq_dma_membase))
 		panic("Failed to remap dma resource");
 
 	/* power up and reset the dma engine */

arch/mips/lantiq/xway/gptu.c

@@ -150,11 +150,9 @@ static int gptu_probe(struct platform_device *pdev)
 	}
 
 	/* remap gptu register range */
-	gptu_membase = devm_request_and_ioremap(&pdev->dev, res);
-	if (!gptu_membase) {
-		dev_err(&pdev->dev, "Failed to remap resource\n");
-		return -ENOMEM;
-	}
+	gptu_membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(gptu_membase))
+		return PTR_ERR(gptu_membase);
 
 	/* enable our clock */
 	clk = clk_get(&pdev->dev, NULL);

arch/mips/pci/pci-lantiq.c

@@ -214,13 +214,13 @@ static int ltq_pci_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	ltq_pci_membase = devm_request_and_ioremap(&pdev->dev, res_bridge);
-	ltq_pci_mapped_cfg = devm_request_and_ioremap(&pdev->dev, res_cfg);
+	ltq_pci_membase = devm_ioremap_resource(&pdev->dev, res_bridge);
+	if (IS_ERR(ltq_pci_membase))
+		return PTR_ERR(ltq_pci_membase);
 
-	if (!ltq_pci_membase || !ltq_pci_mapped_cfg) {
-		dev_err(&pdev->dev, "failed to remap resources\n");
-		return -ENOMEM;
-	}
+	ltq_pci_mapped_cfg = devm_ioremap_resource(&pdev->dev, res_cfg);
+	if (IS_ERR(ltq_pci_mapped_cfg))
+		return PTR_ERR(ltq_pci_mapped_cfg);
 
 	ltq_pci_startup(pdev);