Re: [PATCH] hwrng: exynos - Fix unbalanced PM runtime get/puts

[Herbert Xu]

On Fri, Oct 16, 2015 at 05:01:51PM +0100, Daniel Thompson wrote:
> 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 
> Cc: Kukjin Kim 
> Cc: Krzysztof Kozlowski 

Patch applied.  Thanks.
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Re: [PATCH] hwrng: exynos - Fix unbalanced PM runtime get/puts

[Krzysztof Kozlowski]

On 17.10.2015 01:01, Daniel Thompson wrote:
> 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 
> Cc: Kukjin Kim 
> Cc: Krzysztof Kozlowski 
> ---
> 
> Notes:
> Compile tested only (CONFIG_PM=y, CONFIG_HW_RANDOM_EXYNOS=m); I spotted
> this whilst reviewing the code and don't have an exynos platform to
> test on.
> 
>  drivers/char/hw_random/exynos-rng.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

To test the patch I had to add OF support to the driver. I have these
patches almost ready and I will send them soon. Anyway:

Tested on Trats2 board (Exynos4412):
Tested-by: Krzysztof Kozlowski 

Reviewed-by: Krzysztof Kozlowski 

Best regards,
Krzysztof


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[PATCH] hwrng: exynos - Fix unbalanced PM runtime get/puts

[Daniel Thompson]

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 
Cc: Kukjin Kim 
Cc: Krzysztof Kozlowski 
---

Notes:
Compile tested only (CONFIG_PM=y, CONFIG_HW_RANDOM_EXYNOS=m); I spotted
this whilst reviewing the code and don't have an exynos platform to
test on.

 drivers/char/hw_random/exynos-rng.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/exynos-rng.c 
b/drivers/char/hw_random/exynos-rng.c
index dc4701fd814f..73318e2a34dd 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -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;
 }
--
2.4.3

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