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>

diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index bf9fc6b..dfeddf2 100644 (file)
--- 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))