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If devm_hwrng_register() fails, probe returns without dropping the runtime PM usage count or disabling runtime PM. Unwind the runtime PM state on the registration failure path, matching the cleanup done by remove(). Fixes: e9009fb227fa ("hwrng: ks-sa - Use pm_runtime_resume_and_get() to replace open coding") Signed-off-by: Yuho Choi --- drivers/char/hw_random/ks-sa-rng.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/char/hw_random/ks-sa-rng.c b/drivers/char/hw_random/ks-sa-rng.c index 9e408144a10c..4494f1e4ab4d 100644 --- a/drivers/char/hw_random/ks-sa-rng.c +++ b/drivers/char/hw_random/ks-sa-rng.c @@ -242,7 +242,14 @@ static int ks_sa_rng_probe(struct platform_device *pdev) return dev_err_probe(dev, ret, "Failed to enable SA power-domain\n"); } - return devm_hwrng_register(&pdev->dev, &ks_sa_rng->rng); + ret = devm_hwrng_register(dev, &ks_sa_rng->rng); + if (ret) { + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + return ret; + } + + return 0; } static void ks_sa_rng_remove(struct platform_device *pdev) -- 2.43.0