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hwrng: exynos - Fix runtime PM imbalance on error 

[ 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@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Łukasz Stelmach 2021-05-05 20:29:14 +02:00 committed by Greg Kroah-Hartman
parent 022cf057e4
commit f4c8a00d61
1 changed files with 2 additions and 2 deletions
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4
drivers/char/hw_random/exynos-trng.c
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@ -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);