linux-kernel - [PATCH] hw_random: mxc-rnga: Use devm_ioremap

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Date:	Wed, 13 Mar 2013 00:57:27 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	herbert@...dor.apana.org.au
Cc:	s.hauer@...gutronix.de, linux-kernel@...r.kernel.org,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH] hw_random: mxc-rnga: Use devm_ioremap_resource()

From: Fabio Estevam <fabio.estevam@...escale.com>

Using devm_ioremap_resource() can make the code cleaner and simpler.

Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
---
 drivers/char/hw_random/mxc-rnga.c |   21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
index f05d857..93fc741 100644
--- a/drivers/char/hw_random/mxc-rnga.c
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -142,7 +142,7 @@ static void mxc_rnga_cleanup(struct hwrng *rng)
 static int __init mxc_rnga_probe(struct platform_device *pdev)
 {
 	int err = -ENODEV;
-	struct resource *res, *mem;
+	struct resource *res;
 	struct mxc_rng *mxc_rng;
 
 	mxc_rng = devm_kzalloc(&pdev->dev, sizeof(struct mxc_rng),
@@ -172,15 +172,9 @@ static int __init mxc_rnga_probe(struct platform_device *pdev)
 		goto err_region;
 	}
 
-	mem = request_mem_region(res->start, resource_size(res), pdev->name);
-	if (mem == NULL) {
-		err = -EBUSY;
-		goto err_region;
-	}
-
-	mxc_rng->mem = ioremap(res->start, resource_size(res));
-	if (!mxc_rng->mem) {
-		err = -ENOMEM;
+	mxc_rng->mem = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mxc_rng->mem)) {
+		err = PTR_ERR(mxc_rng->mem);
 		goto err_ioremap;
 	}
 
@@ -195,8 +189,6 @@ static int __init mxc_rnga_probe(struct platform_device *pdev)
 	return 0;
 
 err_ioremap:
-	release_mem_region(res->start, resource_size(res));
-
 err_region:
 	clk_disable_unprepare(mxc_rng->clk);
 
@@ -206,15 +198,10 @@ out:
 
 static int __exit mxc_rnga_remove(struct platform_device *pdev)
 {
-	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct mxc_rng *mxc_rng = platform_get_drvdata(pdev);
 
 	hwrng_unregister(&mxc_rng->rng);
 
-	iounmap(mxc_rng->mem);
-
-	release_mem_region(res->start, resource_size(res));
-
 	clk_disable_unprepare(mxc_rng->clk);
 
 	return 0;
-- 
1.7.9.5

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