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path: root/drivers/char/hw_random/atmel-rng.c
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Diffstat (limited to 'drivers/char/hw_random/atmel-rng.c')
-rw-r--r--drivers/char/hw_random/atmel-rng.c23
1 files changed, 6 insertions, 17 deletions
diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index bf9fc6b79328..851bc7e20ad2 100644
--- a/drivers/char/hw_random/atmel-rng.c
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -54,29 +54,22 @@ 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);
+ trng->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(trng->clk))
return PTR_ERR(trng->clk);
ret = clk_enable(trng->clk);
if (ret)
- goto err_enable;
+ return ret;
writel(TRNG_KEY | 1, trng->base + TRNG_CR);
trng->rng.name = pdev->name;
@@ -92,9 +85,6 @@ static int atmel_trng_probe(struct platform_device *pdev)
err_register:
clk_disable(trng->clk);
-err_enable:
- clk_put(trng->clk);
-
return ret;
}
@@ -106,7 +96,6 @@ static int atmel_trng_remove(struct platform_device *pdev)
writel(TRNG_KEY, trng->base + TRNG_CR);
clk_disable(trng->clk);
- clk_put(trng->clk);
return 0;
}