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hwrng: exynos - Fix unbalanced PM runtime get/puts 

Currently this driver calls pm_runtime_get_sync() rampantly
but never puts anything back. This makes it impossible for the
device to autosuspend properly; it will remain fully active
after the first use.

Fix in the obvious way.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Daniel Thompson 2015-10-16 17:01:51 +01:00 committed by Herbert Xu
parent 839a42af94
commit f02b7d0c7b
1 changed files with 1 additions and 1 deletions
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2
drivers/char/hw_random/exynos-rng.c
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@ -95,7 +95,7 @@ static int exynos_read(struct hwrng *rng, void *buf,
*data = exynos_rng_readl(exynos_rng, EXYNOS_PRNG_OUT1_OFFSET);
pm_runtime_mark_last_busy(exynos_rng->dev);
pm_runtime_autosuspend(exynos_rng->dev);
pm_runtime_put_sync_autosuspend(exynos_rng->dev);
return 4;
}