[PATCH v2 3/4] hwrng: exynos - Disable runtime PM on probe failure

[Krzysztof Kozlowski]

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.kozlow...@samsung.com>

---

Changes since v1:
1. Call also pm_runtime_dont_use_autosuspend() to revert everything set
   during probe.
---
 drivers/char/hw_random/exynos-rng.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/exynos-rng.c 
b/drivers/char/hw_random/exynos-rng.c
index 38b80f82ddd2..71b45b153cf2 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -119,6 +119,7 @@ static int exynos_rng_probe(struct platform_device *pdev)
 {
        struct exynos_rng *exynos_rng;
        struct resource *res;
+       int ret;
 
        exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng),
                                        GFP_KERNEL);
@@ -146,7 +147,13 @@ static int exynos_rng_probe(struct platform_device *pdev)
        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;
 }
 
 static int __maybe_unused exynos_rng_runtime_suspend(struct device *dev)
-- 
2.5.0