linux-kernel - Re: [PATCH 02/25] staging: media: imx7-mipi-csis: fix pm_runtime_get

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Date:   Wed, 5 May 2021 13:17:27 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     <linuxarm@...wei.com>, <mauro.chehab@...wei.com>,
        Fabio Estevam <festevam@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <linux-staging@...ts.linux.dev>
Subject: Re: [PATCH 02/25] staging: media: imx7-mipi-csis: fix
 pm_runtime_get_sync() usage count

Em Wed, 5 May 2021 12:06:52 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> escreveu:

> On Wed, 5 May 2021 11:41:52 +0200
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
> 
> > The pm_runtime_get_sync() internally increments the
> > dev->power.usage_count without decrementing it, even on errors.
> > Replace it by the new pm_runtime_resume_and_get(), introduced by:
> > commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> > in order to properly decrement the usage counter, avoiding
> > a potential PM usage counter leak.
> > 
> > Acked-by: Rui Miguel Silva <rmfrfs@...il.com>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>  
> 
> Not a fix as far as I can see, just a cleanup - so perhaps not this set?

Yeah, will move it to the non-error patch pile and change the comments.

> 
> Jonathan
> 
> 
> > ---
> >  drivers/staging/media/imx/imx7-mipi-csis.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> > index 025fdc488bd6..1dc680d94a46 100644
> > --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> > +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> > @@ -695,11 +695,10 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
> >  
> >  		mipi_csis_clear_counters(state);
> >  
> > -		ret = pm_runtime_get_sync(&state->pdev->dev);
> > -		if (ret < 0) {
> > -			pm_runtime_put_noidle(&state->pdev->dev);
> > +		ret = pm_runtime_resume_and_get(&state->pdev->dev);
> > +		if (ret < 0)
> >  			return ret;
> > -		}
> > +
> >  		ret = v4l2_subdev_call(state->src_sd, core, s_power, 1);
> >  		if (ret < 0 && ret != -ENOIOCTLCMD)
> >  			goto done;  
> 



Thanks,
Mauro