4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
commit 48a61e1e2af8020f11a2b8f8dc878144477623c6 upstream.
Add proper error path (for disabling runtime PM) when registering of
hwrng fails.
Fixes: b329669ea0b5 ("hwrng: exynos - Add support for Exynos random number generator")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/hw_random/exynos-rng.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -118,6 +118,7 @@ static int exynos_rng_probe(struct platf
{
struct exynos_rng *exynos_rng;
struct resource *res;
+ int ret;
exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng),
GFP_KERNEL);
@@ -145,7 +146,13 @@ static int exynos_rng_probe(struct platf
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_enable(&pdev->dev);
- return devm_hwrng_register(&pdev->dev, &exynos_rng->rng);
+ ret = devm_hwrng_register(&pdev->dev, &exynos_rng->rng);
+ if (ret) {
+ pm_runtime_dont_use_autosuspend(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ }
+
+ return ret;
}
#ifdef CONFIG_PM
--
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