mtd: davinci_nand: Use managed resources

davinci_nand driver currently uses normal kzalloc, ioremap and get_clk
routines. This patch replaces these routines with devm_kzalloc,
devm_request_and_ioremap and devm_clk_get resp.

Signed-off-by: Mrugesh Katepallewar <[e-mail]>
Signed-off-by: Artem Bityutskiy <[e-mail]>

drivers/mtd/nand/davinci_nand.c

···
 	if (pdev->id < 0 || pdev->id > 3)
 		return -ENODEV;
 
-	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		dev_err(&pdev->dev, "unable to allocate memory\n");
 		ret = -ENOMEM;
···
 		goto err_nomem;
 	}
 
-	vaddr = ioremap(res1->start, resource_size(res1));
-	base = ioremap(res2->start, resource_size(res2));
+	vaddr = devm_request_and_ioremap(&pdev->dev, res1);
+	base = devm_request_and_ioremap(&pdev->dev, res2);
 	if (!vaddr || !base) {
 		dev_err(&pdev->dev, "ioremap failed\n");
-		ret = -EINVAL;
+		ret = -EADDRNOTAVAIL;
 		goto err_ioremap;
 	}
 
···
 	}
 	info->chip.ecc.mode = ecc_mode;
 
-	info->clk = clk_get(&pdev->dev, "aemif");
+	info->clk = devm_clk_get(&pdev->dev, "aemif");
 	if (IS_ERR(info->clk)) {
 		ret = PTR_ERR(info->clk);
 		dev_dbg(&pdev->dev, "unable to get AEMIF clock, err %d\n", ret);
···
 	clk_disable_unprepare(info->clk);
 
 err_clk_enable:
-	clk_put(info->clk);
-
 	spin_lock_irq(&davinci_nand_lock);
 	if (ecc_mode == NAND_ECC_HW_SYNDROME)
 		ecc4_busy = false;
···
 err_ecc:
 err_clk:
 err_ioremap:
-	if (base)
-		iounmap(base);
-	if (vaddr)
-		iounmap(vaddr);
-
 err_nomem:
-	kfree(info);
 	return ret;
 }
 
···
 		ecc4_busy = false;
 	spin_unlock_irq(&davinci_nand_lock);
 
-	iounmap(info->base);
-	iounmap(info->vaddr);
-
 	nand_release(&info->mtd);
 
 	clk_disable_unprepare(info->clk);
-	clk_put(info->clk);
-
-	kfree(info);
 
 	return 0;
 }