linux-kernel - [PATCH RESEND 4/7] watchdog: nuc900_wdt: use devm

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Date:	Mon, 29 Apr 2013 18:35:33 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, 'Wim Van Sebroeck' <wim@...ana.be>,
	linux-watchdog@...r.kernel.org, Jingoo Han <jg1.han@...sung.com>
Subject: [PATCH RESEND 4/7] watchdog: nuc900_wdt: use devm_*() functions

Use devm_*() functions to make cleanup paths simpler.

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/watchdog/nuc900_wdt.c |   45 ++++++++--------------------------------
 1 files changed, 9 insertions(+), 36 deletions(-)

diff --git a/drivers/watchdog/nuc900_wdt.c b/drivers/watchdog/nuc900_wdt.c
index 04c45a1..89e8991 100644
--- a/drivers/watchdog/nuc900_wdt.c
+++ b/drivers/watchdog/nuc900_wdt.c
@@ -246,7 +246,8 @@ static int nuc900wdt_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 
-	nuc900_wdt = kzalloc(sizeof(struct nuc900_wdt), GFP_KERNEL);
+	nuc900_wdt = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_wdt),
+				GFP_KERNEL);
 	if (!nuc900_wdt)
 		return -ENOMEM;
 
@@ -257,30 +258,18 @@ static int nuc900wdt_probe(struct platform_device *pdev)
 	nuc900_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (nuc900_wdt->res == NULL) {
 		dev_err(&pdev->dev, "no memory resource specified\n");
-		ret = -ENOENT;
-		goto err_get;
+		return -ENOENT;
 	}
 
-	if (!request_mem_region(nuc900_wdt->res->start,
-				resource_size(nuc900_wdt->res), pdev->name)) {
-		dev_err(&pdev->dev, "failed to get memory region\n");
-		ret = -ENOENT;
-		goto err_get;
-	}
-
-	nuc900_wdt->wdt_base = ioremap(nuc900_wdt->res->start,
-					resource_size(nuc900_wdt->res));
-	if (nuc900_wdt->wdt_base == NULL) {
-		dev_err(&pdev->dev, "failed to ioremap() region\n");
-		ret = -EINVAL;
-		goto err_req;
-	}
+	nuc900_wdt->wdt_base = devm_ioremap_resource(&pdev->dev,
+						nuc900_wdt->res);
+	if (IS_ERR(nuc900_wdt->wdt_base))
+		return PTR_ERR(nuc900_wdt->wdt_base);
 
-	nuc900_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
+	nuc900_wdt->wdt_clock = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(nuc900_wdt->wdt_clock)) {
 		dev_err(&pdev->dev, "failed to find watchdog clock source\n");
-		ret = PTR_ERR(nuc900_wdt->wdt_clock);
-		goto err_map;
+		return PTR_ERR(nuc900_wdt->wdt_clock);
 	}
 
 	clk_enable(nuc900_wdt->wdt_clock);
@@ -298,14 +287,6 @@ static int nuc900wdt_probe(struct platform_device *pdev)
 
 err_clk:
 	clk_disable(nuc900_wdt->wdt_clock);
-	clk_put(nuc900_wdt->wdt_clock);
-err_map:
-	iounmap(nuc900_wdt->wdt_base);
-err_req:
-	release_mem_region(nuc900_wdt->res->start,
-					resource_size(nuc900_wdt->res));
-err_get:
-	kfree(nuc900_wdt);
 	return ret;
 }
 
@@ -314,14 +295,6 @@ static int nuc900wdt_remove(struct platform_device *pdev)
 	misc_deregister(&nuc900wdt_miscdev);
 
 	clk_disable(nuc900_wdt->wdt_clock);
-	clk_put(nuc900_wdt->wdt_clock);
-
-	iounmap(nuc900_wdt->wdt_base);
-
-	release_mem_region(nuc900_wdt->res->start,
-					resource_size(nuc900_wdt->res));
-
-	kfree(nuc900_wdt);
 
 	return 0;
 }
-- 
1.7.2.5


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