commit f02b7d0c7b433b9a8175ac9027391272877a43ce
author Daniel Thompson <daniel.thompson@linaro.org> Fri Oct 16 17:01:51 2015 +0100
committer Herbert Xu <herbert@gondor.apana.org.au> Tue Oct 20 22:10:46 2015 +0800
tree 314e976867de305f7069a1f00a0dcd4957167ba7
parent 839a42af9441982311f33241529f711f23c857c8

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>

drivers/char/hw_random/exynos-rng.c

diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
index dc4701f..73318e2a 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -95,7 +95,7 @@
 	*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;
 }