[PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[Chuhong Yuan]

All drivers in imx call v4l2_async_notifier_cleanup() after unregistering
the notifier except this driver.
This should be a miss and we need to add the call to fix it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
---
 drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 99166afca071..2bfa85bb84e7 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -1105,6 +1105,7 @@ static int mipi_csis_remove(struct platform_device *pdev)
 	mipi_csis_debugfs_exit(state);
 	v4l2_async_unregister_subdev(&state->mipi_sd);
 	v4l2_async_notifier_unregister(&state->subdev_notifier);
+	v4l2_async_notifier_cleanup(&state->subdev_notifier);
 
 	pm_runtime_disable(&pdev->dev);
 	mipi_csis_pm_suspend(&pdev->dev, true);
-- 
2.24.0

Re: [PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[Rui Miguel Silva]

Hi Chuhong,
Thanks for the patch.

On Mon, Dec 09, 2019 at 04:58:28PM +0800, Chuhong Yuan wrote:
> All drivers in imx call v4l2_async_notifier_cleanup() after unregistering
> the notifier except this driver.
> This should be a miss and we need to add the call to fix it.
> 
> Signed-off-by: Chuhong Yuan <hslester96@gmail.com>

Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>

------
Cheers,
     Rui
> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 99166afca071..2bfa85bb84e7 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -1105,6 +1105,7 @@ static int mipi_csis_remove(struct platform_device *pdev)
>  	mipi_csis_debugfs_exit(state);
>  	v4l2_async_unregister_subdev(&state->mipi_sd);
>  	v4l2_async_notifier_unregister(&state->subdev_notifier);
> +	v4l2_async_notifier_cleanup(&state->subdev_notifier);
>  
>  	pm_runtime_disable(&pdev->dev);
>  	mipi_csis_pm_suspend(&pdev->dev, true);
> -- 
> 2.24.0
> 

Re: [PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[Dan Carpenter]

On Mon, Dec 09, 2019 at 04:58:28PM +0800, Chuhong Yuan wrote:
> All drivers in imx call v4l2_async_notifier_cleanup() after unregistering
> the notifier except this driver.
> This should be a miss and we need to add the call to fix it.
> 
> Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index 99166afca071..2bfa85bb84e7 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -1105,6 +1105,7 @@ static int mipi_csis_remove(struct platform_device *pdev)
>  	mipi_csis_debugfs_exit(state);
>  	v4l2_async_unregister_subdev(&state->mipi_sd);
>  	v4l2_async_notifier_unregister(&state->subdev_notifier);
> +	v4l2_async_notifier_cleanup(&state->subdev_notifier);
>  

In this case the "state->subdev_notifier" was never initialized or used
so both v4l2_async_notifier_unregister() and v4l2_async_notifier_cleanup()
are no-ops.

We should just delete "subdev_notifier".

regards,
dan carpenter

Re: [PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[Philipp Zabel]

On Thu, 2019-12-12 at 14:51 +0300, Dan Carpenter wrote:
> On Mon, Dec 09, 2019 at 04:58:28PM +0800, Chuhong Yuan wrote:
> > All drivers in imx call v4l2_async_notifier_cleanup() after unregistering
> > the notifier except this driver.
> > This should be a miss and we need to add the call to fix it.
> > 
> > Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
> > ---
> >  drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> > index 99166afca071..2bfa85bb84e7 100644
> > --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> > +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> > @@ -1105,6 +1105,7 @@ static int mipi_csis_remove(struct platform_device *pdev)
> >  	mipi_csis_debugfs_exit(state);
> >  	v4l2_async_unregister_subdev(&state->mipi_sd);
> >  	v4l2_async_notifier_unregister(&state->subdev_notifier);
> > +	v4l2_async_notifier_cleanup(&state->subdev_notifier);
> >  
> 
> In this case the "state->subdev_notifier" was never initialized or used
> so both v4l2_async_notifier_unregister() and v4l2_async_notifier_cleanup()
> are no-ops.
> 
> We should just delete "subdev_notifier".

I agree with Dan and Hans, the subdev_notifier field and the
v4l2_async_notifier_unregister() call should be removed. Since
this issue was there from the start, the patch can be tagged
as fixing commit 7807063b862b.

regards
Philipp

Re: [PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[Rui Miguel Silva]

Hi Dan,
Thanks for the inputs.
On Thu, Dec 12, 2019 at 02:51:34PM +0300, Dan Carpenter wrote:
> On Mon, Dec 09, 2019 at 04:58:28PM +0800, Chuhong Yuan wrote:
> > All drivers in imx call v4l2_async_notifier_cleanup() after
> > unregistering the notifier except this driver.  This should be a
> > miss and we need to add the call to fix it.
> > 
> > Signed-off-by: Chuhong Yuan <hslester96@gmail.com> ---
> > drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c
> > b/drivers/staging/media/imx/imx7-mipi-csis.c index
> > 99166afca071..2bfa85bb84e7 100644 ---
> > a/drivers/staging/media/imx/imx7-mipi-csis.c +++
> > b/drivers/staging/media/imx/imx7-mipi-csis.c @@ -1105,6 +1105,7 @@
> > static int mipi_csis_remove(struct platform_device *pdev)
> > mipi_csis_debugfs_exit(state);
> > v4l2_async_unregister_subdev(&state->mipi_sd);
> > v4l2_async_notifier_unregister(&state->subdev_notifier); +
> > v4l2_async_notifier_cleanup(&state->subdev_notifier);
> >  
> 
> In this case the "state->subdev_notifier" was never initialized or
> used so both v4l2_async_notifier_unregister() and
> v4l2_async_notifier_cleanup() are no-ops.

I have applied this patch on top of Steve's series [0], since by the
timeline I was expecting to be applied before this one, that series
adds a bound notifier, even though, it is not named the same, eheh.

That trigged me to think that this cleanup was correct since a
notifier was initialized in probe.

But as you say, it is a no-ops in the end.

@Steve, that said, it looks that in [0], you will need to add some
unregister and cleanup for the notifiers that you are adding in
several places.

A patch to fix this will follow.

------
Cheers,
     Rui



[0]: https://patchwork.kernel.org/project/linux-media/list/?series=207517

> 
> We should just delete "subdev_notifier".
> 
> regards, dan carpenter
> 
> _______________________________________________ devel mailing list
> devel@linuxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Re: [PATCH] media: imx7-mipi-csis: Add the missed v4l2_async_notifier_cleanup in remove

[Steve Longerbeam]

On 12/12/19 11:08 AM, Rui Miguel Silva wrote:
> Hi Dan,
> Thanks for the inputs.
> On Thu, Dec 12, 2019 at 02:51:34PM +0300, Dan Carpenter wrote:
>> On Mon, Dec 09, 2019 at 04:58:28PM +0800, Chuhong Yuan wrote:
>>> All drivers in imx call v4l2_async_notifier_cleanup() after
>>> unregistering the notifier except this driver.  This should be a
>>> miss and we need to add the call to fix it.
>>>
>>> Signed-off-by: Chuhong Yuan <hslester96@gmail.com> ---
>>> drivers/staging/media/imx/imx7-mipi-csis.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c
>>> b/drivers/staging/media/imx/imx7-mipi-csis.c index
>>> 99166afca071..2bfa85bb84e7 100644 ---
>>> a/drivers/staging/media/imx/imx7-mipi-csis.c +++
>>> b/drivers/staging/media/imx/imx7-mipi-csis.c @@ -1105,6 +1105,7 @@
>>> static int mipi_csis_remove(struct platform_device *pdev)
>>> mipi_csis_debugfs_exit(state);
>>> v4l2_async_unregister_subdev(&state->mipi_sd);
>>> v4l2_async_notifier_unregister(&state->subdev_notifier); +
>>> v4l2_async_notifier_cleanup(&state->subdev_notifier);
>>>   
>> In this case the "state->subdev_notifier" was never initialized or
>> used so both v4l2_async_notifier_unregister() and
>> v4l2_async_notifier_cleanup() are no-ops.
> I have applied this patch on top of Steve's series [0], since by the
> timeline I was expecting to be applied before this one, that series
> adds a bound notifier, even though, it is not named the same, eheh.
>
> That trigged me to think that this cleanup was correct since a
> notifier was initialized in probe.
>
> But as you say, it is a no-ops in the end.
>
> @Steve, that said, it looks that in [0], you will need to add some
> unregister and cleanup for the notifiers that you are adding in
> several places.

Well, turns out I had failed to notice that an async notifier was 
already included in 'struct imx7_csi' as 'subdev_notifier', even though 
it was unused. So I ended up creating a duplicate 'notifier'. I'll 
cleaning that up in v3 of [0].

Steve

> A patch to fix this will follow.
>
> ------
> Cheers,
>       Rui
>
>
>
> [0]: https://patchwork.kernel.org/project/linux-media/list/?series=207517
>
>> We should just delete "subdev_notifier".
>>
>> regards, dan carpenter
>>
>> _______________________________________________ devel mailing list
>> devel@linuxdriverproject.org
>> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel