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@samsung.com>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 4 insertions, 11 deletions

diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index bf9fc6b79328..dfeddf2c00b7 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))