pm_runtime_get_sync will increment pm usage counter even
failed. Forgetting to putting operation will result in a
reference leak here.
Replace it with pm_runtime_resume_and_get to keep usage
counter balanced. I remove err_clock label at the same.
Fixes: 6cd225cc5d8a ("hwrng: exynos - add Samsung Exynos True RNG driver")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Suggested-by: Lukasz Stelmach <l.stelmach@xxxxxxxxxxx>
Signed-off-by: Qinglang Miao <miaoqinglang@xxxxxxxxxx>
---
v2: remobe useless label as Lukasz suggested.
drivers/char/hw_random/exynos-trng.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
index 8e1fe3f8d..ffebb72e4 100644
--- a/drivers/char/hw_random/exynos-trng.c
+++ b/drivers/char/hw_random/exynos-trng.c
@@ -132,7 +132,7 @@ 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;
@@ -142,13 +142,13 @@ static int exynos_trng_probe(struct platform_device *pdev)
if (IS_ERR(trng->clk)) {
ret = PTR_ERR(trng->clk);
dev_err(&pdev->dev, "Could not get clock.\n");
- goto err_clock;
+ goto err_pm_get;
}
ret = clk_prepare_enable(trng->clk);
if (ret) {
dev_err(&pdev->dev, "Could not enable the clk.\n");
- goto err_clock;
+ goto err_pm_get;
}
ret = devm_hwrng_register(&pdev->dev, &trng->rng);
@@ -164,9 +164,6 @@ static int exynos_trng_probe(struct platform_device *pdev)
err_register:
clk_disable_unprepare(trng->clk);
-err_clock:
- pm_runtime_put_sync(&pdev->dev);
-
err_pm_get:
pm_runtime_disable(&pdev->dev);
--
2.23.0
