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* [PATCH] dmaengine: stm32-dmamux: fix pm_runtime_get_sync fialure cases
@ 2020-06-03 19:36 Navid Emamdoost
  2020-06-24  7:40 ` Vinod Koul
  0 siblings, 1 reply; 3+ messages in thread
From: Navid Emamdoost @ 2020-06-03 19:36 UTC (permalink / raw)
  To: Vinod Koul, Dan Williams, Maxime Coquelin, Alexandre Torgue,
	dmaengine, linux-stm32, linux-arm-kernel, linux-kernel
  Cc: emamd001, wu000273, kjlu, smccaman, Navid Emamdoost

Calling pm_runtime_get_sync increments the counter even in case of
failure, causing incorrect ref count. Call pm_runtime_put_sync if
pm_runtime_get_sync fails.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
---
 drivers/dma/stm32-dmamux.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
index 12f7637e13a1..ab250d7eed29 100644
--- a/drivers/dma/stm32-dmamux.c
+++ b/drivers/dma/stm32-dmamux.c
@@ -140,6 +140,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
 	ret = pm_runtime_get_sync(&pdev->dev);
 	if (ret < 0) {
 		spin_unlock_irqrestore(&dmamux->lock, flags);
+		pm_runtime_put_sync(&pdev->dev);
 		goto error;
 	}
 	spin_unlock_irqrestore(&dmamux->lock, flags);
@@ -340,8 +341,10 @@ static int stm32_dmamux_suspend(struct device *dev)
 	int i, ret;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_sync(dev);
 		return ret;
+	}
 
 	for (i = 0; i < stm32_dmamux->dma_requests; i++)
 		stm32_dmamux->ccr[i] = stm32_dmamux_read(stm32_dmamux->iomem,
-- 
2.17.1


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH] dmaengine: stm32-dmamux: fix pm_runtime_get_sync fialure cases
  2020-06-03 19:36 [PATCH] dmaengine: stm32-dmamux: fix pm_runtime_get_sync fialure cases Navid Emamdoost
@ 2020-06-24  7:40 ` Vinod Koul
  2020-06-24  7:56   ` Navid Emamdoost
  0 siblings, 1 reply; 3+ messages in thread
From: Vinod Koul @ 2020-06-24  7:40 UTC (permalink / raw)
  To: Navid Emamdoost
  Cc: Dan Williams, Maxime Coquelin, Alexandre Torgue, dmaengine,
	linux-stm32, linux-arm-kernel, linux-kernel, emamd001, wu000273,
	kjlu, smccaman

On 03-06-20, 14:36, Navid Emamdoost wrote:

s/fialure/failure

> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count. Call pm_runtime_put_sync if
> pm_runtime_get_sync fails.
> 
> Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
> ---
>  drivers/dma/stm32-dmamux.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
> index 12f7637e13a1..ab250d7eed29 100644
> --- a/drivers/dma/stm32-dmamux.c
> +++ b/drivers/dma/stm32-dmamux.c
> @@ -140,6 +140,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
>  	ret = pm_runtime_get_sync(&pdev->dev);
>  	if (ret < 0) {
>  		spin_unlock_irqrestore(&dmamux->lock, flags);
> +		pm_runtime_put_sync(&pdev->dev);

why put_sync()

>  		goto error;
>  	}
>  	spin_unlock_irqrestore(&dmamux->lock, flags);
> @@ -340,8 +341,10 @@ static int stm32_dmamux_suspend(struct device *dev)
>  	int i, ret;
>  
>  	ret = pm_runtime_get_sync(dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put_sync(dev);

here too

>  		return ret;
> +	}
>  
>  	for (i = 0; i < stm32_dmamux->dma_requests; i++)
>  		stm32_dmamux->ccr[i] = stm32_dmamux_read(stm32_dmamux->iomem,
> -- 
> 2.17.1

-- 
~Vinod

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH] dmaengine: stm32-dmamux: fix pm_runtime_get_sync fialure cases
  2020-06-24  7:40 ` Vinod Koul
@ 2020-06-24  7:56   ` Navid Emamdoost
  0 siblings, 0 replies; 3+ messages in thread
From: Navid Emamdoost @ 2020-06-24  7:56 UTC (permalink / raw)
  To: Vinod Koul
  Cc: Dan Williams, Maxime Coquelin, Alexandre Torgue, dmaengine,
	linux-stm32, linux-arm-kernel, LKML, Navid Emamdoost, Qiushi Wu,
	Kangjie Lu, Stephen McCamant

On Wed, Jun 24, 2020 at 2:40 AM Vinod Koul <vkoul@kernel.org> wrote:
>
> On 03-06-20, 14:36, Navid Emamdoost wrote:
>
> s/fialure/failure
>
> > Calling pm_runtime_get_sync increments the counter even in case of
> > failure, causing incorrect ref count. Call pm_runtime_put_sync if
> > pm_runtime_get_sync fails.
> >
> > Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
> > ---
> >  drivers/dma/stm32-dmamux.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
> > index 12f7637e13a1..ab250d7eed29 100644
> > --- a/drivers/dma/stm32-dmamux.c
> > +++ b/drivers/dma/stm32-dmamux.c
> > @@ -140,6 +140,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
> >       ret = pm_runtime_get_sync(&pdev->dev);
> >       if (ret < 0) {
> >               spin_unlock_irqrestore(&dmamux->lock, flags);
> > +             pm_runtime_put_sync(&pdev->dev);
>
> why put_sync()
>
> >               goto error;
> >       }
> >       spin_unlock_irqrestore(&dmamux->lock, flags);
> > @@ -340,8 +341,10 @@ static int stm32_dmamux_suspend(struct device *dev)
> >       int i, ret;
> >
> >       ret = pm_runtime_get_sync(dev);
> > -     if (ret < 0)
> > +     if (ret < 0) {
> > +             pm_runtime_put_sync(dev);
>
> here too

Is put_noidle() better?

>
> >               return ret;
> > +     }
> >
> >       for (i = 0; i < stm32_dmamux->dma_requests; i++)
> >               stm32_dmamux->ccr[i] = stm32_dmamux_read(stm32_dmamux->iomem,
> > --
> > 2.17.1
>
> --
> ~Vinod



-- 
Navid.

^ permalink raw reply	[flat|nested] 3+ messages in thread

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2020-06-03 19:36 [PATCH] dmaengine: stm32-dmamux: fix pm_runtime_get_sync fialure cases Navid Emamdoost
2020-06-24  7:40 ` Vinod Koul
2020-06-24  7:56   ` Navid Emamdoost

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