linux-kernel - [PATCH 1/2] hwrng: atmel - Use devm_ioremap

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Date:	Wed, 12 Feb 2014 14:17:08 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Herbert Xu' <herbert@...dor.apana.org.au>
Cc:	linux-kernel@...r.kernel.org,
	'Nicolas Ferre' <nicolas.ferre@...el.com>,
	'Peter Korsgaard' <jacmet@...site.dk>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH 1/2] hwrng: atmel - Use devm_ioremap_resource()

Use devm_ioremap_resource() in order to make the code simpler,
and remove redundant return value check of platform_get_resource()
because the value is checked by devm_ioremap_resource().

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/char/hw_random/atmel-rng.c |   15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index bf9fc6b..dfeddf2 100644
--- a/drivers/char/hw_random/atmel-rng.c
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -54,21 +54,14 @@ static int atmel_trng_probe(struct platform_device *pdev)
 	struct resource *res;
 	int ret;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -EINVAL;
-
 	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
 	if (!trng)
 		return -ENOMEM;
 
-	if (!devm_request_mem_region(&pdev->dev, res->start,
-				     resource_size(res), pdev->name))
-		return -EBUSY;
-
-	trng->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
-	if (!trng->base)
-		return -EBUSY;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	trng->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(trng->base))
+		return PTR_ERR(trng->base);
 
 	trng->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(trng->clk))
-- 
1.7.10.4


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