hwrng: mxc-rnga - Use devm_ioremap_resource()

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

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
index f05d85713fd327a3c794deaea084c45e15fc9a1e..93fc74164ee64b5ba97aad2f3d3924baee53649a 100644 (file)
--- 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;