linux-kernel - Re: [PATCH v2] media: atmel: atmel-isc: Fix PM disable depth imbalance in atmel_isc

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Date:   Wed, 2 Mar 2022 13:44:57 +0800
From:   Miaoqian Lin <linmq006@...il.com>
To:     Eugen.Hristev@...rochip.com
Cc:     mchehab@...nel.org, Nicolas.Ferre@...rochip.com,
        alexandre.belloni@...tlin.com, Ludovic.Desroches@...rochip.com,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: atmel: atmel-isc: Fix PM disable depth
 imbalance in atmel_isc_probe

On Tue, Mar 01, 2022 at 01:51:02PM +0000, Eugen.Hristev@...rochip.com wrote:
> > ---
> > changes in v2:
> > - remove unused label.
> > ---
> >   drivers/media/platform/atmel/atmel-sama5d2-isc.c | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> > index 1b2063cce0f7..7f1ebbb25437 100644
> > --- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> > +++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> > @@ -559,6 +559,8 @@ static int atmel_isc_probe(struct platform_device *pdev)
> >   cleanup_subdev:
> >          isc_subdev_cleanup(isc);
> > 
> > +       pm_runtime_disable(dev);
> > +
> 
> Hello Miaoqian Lin ,
> 
> Could you please perform the same change (or similar) in 
> atmel-sama7g5-isc , as the sama7g5 ISC will perform the same and has the 
> same bug.
> 
Hi, Eugen Hristev:

I think you are referring to microchip_xisc_probe() function in
atmel-sama7g5-isc, and I have look into it. After it calls
pm_runtime_enable(), it only have a regular path whichs return 0 and
indicates
the probe is successful. It doesn't have error handling path.

regmap_read() function returns a negative errno in error cases, but it
is used to get Microchip XISC version. I am not sure if failure means
the probe fails.
> >   unregister_v4l2_device:
> >          v4l2_device_unregister(&isc->v4l2_dev);
> > 
> > --
> > 2.17.1
> > 
>