mtd: nand: pxa3xx: Use devm_ioremap_resource

Using the new devm_ioremap_resource() we can greatly
simplify resource handling.
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/pxa3xx_nand.c

@@ -1108,30 +1108,16 @@ static int alloc_nand_resource(struct platform_device *pdev)
 	}
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "no IO memory resource defined\n");
-		ret = -ENODEV;
-		goto fail_put_clk;
-	}
-
-	r = request_mem_region(r->start, resource_size(r), pdev->name);
-	if (r == NULL) {
-		dev_err(&pdev->dev, "failed to request memory resource\n");
-		ret = -EBUSY;
+	info->mmio_base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(info->mmio_base)) {
+		ret = PTR_ERR(info->mmio_base);
 		goto fail_put_clk;
 	}
-
-	info->mmio_base = ioremap(r->start, resource_size(r));
-	if (info->mmio_base == NULL) {
-		dev_err(&pdev->dev, "ioremap() failed\n");
-		ret = -ENODEV;
-		goto fail_free_res;
-	}
 	info->mmio_phys = r->start;
 
 	ret = pxa3xx_nand_init_buff(info);
 	if (ret)
-		goto fail_free_io;
+		goto fail_put_clk;
 
 	/* initialize all interrupts to be disabled */
 	disable_int(info, NDSR_MASK);
@@ -1155,10 +1141,6 @@ static int alloc_nand_resource(struct platform_device *pdev)
 			info->data_buff, info->data_buff_phys);
 	} else
 		kfree(info->data_buff);
-fail_free_io:
-	iounmap(info->mmio_base);
-fail_free_res:
-	release_mem_region(r->start, resource_size(r));
 fail_put_clk:
 	clk_disable(info->clk);
 	clk_put(info->clk);
@@ -1169,7 +1151,6 @@ static int pxa3xx_nand_remove(struct platform_device *pdev)
 {
 	struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
 	struct pxa3xx_nand_platform_data *pdata;
-	struct resource *r;
 	int irq, cs;
 
 	if (!info)
@@ -1188,10 +1169,6 @@ static int pxa3xx_nand_remove(struct platform_device *pdev)
 	} else
 		kfree(info->data_buff);
 
-	iounmap(info->mmio_base);
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(r->start, resource_size(r));
-
 	clk_disable(info->clk);
 	clk_put(info->clk);