[PATCH 5.4 076/348] hwrng: exynos - Fix runtime PM imbalance on error

From: Greg Kroah-Hartman
Date: Mon Jul 12 2021 - 02:20:35 EST


From: Łukasz Stelmach <l.stelmach@xxxxxxxxxxx>

[ Upstream commit 0cdbabf8bb7a6147f5adf37dbc251e92a1bbc2c7 ]

pm_runtime_resume_and_get() wraps around pm_runtime_get_sync() and
decrements the runtime PM usage counter in case the latter function
fails and keeps the counter balanced.

Signed-off-by: Łukasz Stelmach <l.stelmach@xxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/char/hw_random/exynos-trng.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
index b4b52ab23b6b..b4e931dbff66 100644
--- a/drivers/char/hw_random/exynos-trng.c
+++ b/drivers/char/hw_random/exynos-trng.c
@@ -134,7 +134,7 @@ static int exynos_trng_probe(struct platform_device *pdev)
return PTR_ERR(trng->mem);

pm_runtime_enable(&pdev->dev);
- ret = pm_runtime_get_sync(&pdev->dev);
+ ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "Could not get runtime PM.\n");
goto err_pm_get;
@@ -167,7 +167,7 @@ err_register:
clk_disable_unprepare(trng->clk);

err_clock:
- pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_put_noidle(&pdev->dev);

err_pm_get:
pm_runtime_disable(&pdev->dev);
--
2.30.2