hwrng: pixocell - 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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 3 insertions, 16 deletions

diff --git a/drivers/char/hw_random/picoxcell-rng.c b/drivers/char/hw_random/picoxcell-rng.c
index 3d4c2293c6f5..c03beeeb1aea 100644
--- a/drivers/char/hw_random/picoxcell-rng.c
+++ b/drivers/char/hw_random/picoxcell-rng.c
@@ -104,22 +104,9 @@ static int picoxcell_trng_probe(struct platform_device *pdev)
         int ret;
         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
-        if (!mem) {
-                dev_warn(&pdev->dev, "no memory resource\n");
-                return -ENOMEM;
-        }
-
-        if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
-                                     "picoxcell_trng")) {
-                dev_warn(&pdev->dev, "unable to request io mem\n");
-                return -EBUSY;
-        }
-
-        rng_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
-        if (!rng_base) {
-                dev_warn(&pdev->dev, "unable to remap io mem\n");
-                return -ENOMEM;
-        }
+        rng_base = devm_ioremap_resource(&pdev->dev, mem);
+        if (IS_ERR(rng_base))
+                return PTR_ERR(rng_base);
 
         rng_clk = clk_get(&pdev->dev, NULL);
         if (IS_ERR(rng_clk)) {