diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
index 48bbfeca4b5d..4673fc4ad931 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -104,6 +104,7 @@ static int exynos_read(struct hwrng *rng, void *buf,
 static int exynos_rng_probe(struct platform_device *pdev)
 {
 	struct exynos_rng *exynos_rng;
+	struct resource *res;
 
 	exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng),
 					GFP_KERNEL);
@@ -120,10 +121,10 @@ static int exynos_rng_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	exynos_rng->mem = devm_request_and_ioremap(&pdev->dev,
-			platform_get_resource(pdev, IORESOURCE_MEM, 0));
-	if (!exynos_rng->mem)
-		return -EBUSY;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	exynos_rng->mem = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(exynos_rng->mem))
+		return PTR_ERR(exynos_rng->mem);
 
 	platform_set_drvdata(pdev, exynos_rng);
 
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index d8c54e253761..749dc16ca2cc 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -124,9 +124,9 @@ static int omap_rng_probe(struct platform_device *pdev)
 		goto err_ioremap;
 	}
 
-	priv->base = devm_request_and_ioremap(&pdev->dev, priv->mem_res);
-	if (!priv->base) {
-		ret = -ENOMEM;
+	priv->base = devm_ioremap_resource(&pdev->dev, priv->mem_res);
+	if (IS_ERR(priv->base)) {
+		ret = PTR_ERR(priv->base);
 		goto err_ioremap;
 	}
 	dev_set_drvdata(&pdev->dev, priv);
diff --git a/drivers/char/hw_random/tx4939-rng.c b/drivers/char/hw_random/tx4939-rng.c
index de473ef3882b..30991989d65b 100644
--- a/drivers/char/hw_random/tx4939-rng.c
+++ b/drivers/char/hw_random/tx4939-rng.c
@@ -7,6 +7,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
+#include <linux/err.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -115,9 +116,9 @@ static int __init tx4939_rng_probe(struct platform_device *dev)
 	rngdev = devm_kzalloc(&dev->dev, sizeof(*rngdev), GFP_KERNEL);
 	if (!rngdev)
 		return -ENOMEM;
-	rngdev->base = devm_request_and_ioremap(&dev->dev, r);
-	if (!rngdev->base)
-		return -EBUSY;
+	rngdev->base = devm_ioremap_resource(&dev->dev, r);
+	if (IS_ERR(rngdev->base))
+		return PTR_ERR(rngdev->base);
 
 	rngdev->rng.name = dev_name(&dev->dev);
 	rngdev->rng.data_present = tx4939_rng_data_present;