linux-kernel - Re: [PATCH v4 25/79] staging: media: tegra-vde: use pm_runtime_resume_and

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Message-ID: <20210430181129.00005f1f@Huawei.com>
Date:   Fri, 30 Apr 2021 18:11:29 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
CC:     <linuxarm@...wei.com>, <mauro.chehab@...wei.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Jonathan Hunter" <jonathanh@...dia.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        <devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 25/79] staging: media: tegra-vde: use
 pm_runtime_resume_and_get()

On Fri, 30 Apr 2021 18:08:36 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:

> On Wed, 28 Apr 2021 16:51:46 +0200
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
> 
> > Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> > added pm_runtime_resume_and_get() in order to automatically handle
> > dev->power.usage_count decrement on errors.
> > 
> > Use the new API, in order to cleanup the error check logic.
> > 
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> LGTM
> 
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
drop that.  I missed the misc unwind thing caught in the other review.
Too many patches without a break :(
> 
> > ---
> >  drivers/staging/media/tegra-vde/vde.c | 19 ++++++++++++++++---
> >  1 file changed, 16 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/staging/media/tegra-vde/vde.c b/drivers/staging/media/tegra-vde/vde.c
> > index 28845b5bafaf..1cdacb3f781c 100644
> > --- a/drivers/staging/media/tegra-vde/vde.c
> > +++ b/drivers/staging/media/tegra-vde/vde.c
> > @@ -775,9 +775,9 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
> >  	if (ret)
> >  		goto release_dpb_frames;
> >  
> > -	ret = pm_runtime_get_sync(dev);
> > +	ret = pm_runtime_resume_and_get(dev);
> >  	if (ret < 0)
> > -		goto put_runtime_pm;
> > +		goto unlock;
> >  
> >  	/*
> >  	 * We rely on the VDE registers reset value, otherwise VDE
> > @@ -843,6 +843,8 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
> >  put_runtime_pm:
> >  	pm_runtime_mark_last_busy(dev);
> >  	pm_runtime_put_autosuspend(dev);
> > +
> > +unlock:
> >  	mutex_unlock(&vde->lock);
> >  
> >  release_dpb_frames:
> > @@ -1069,11 +1071,17 @@ static int tegra_vde_probe(struct platform_device *pdev)
> >  	 * power-cycle it in order to put hardware into a predictable lower
> >  	 * power state.
> >  	 */
> > -	pm_runtime_get_sync(dev);
> > +	if (pm_runtime_resume_and_get(dev) < 0)
> > +		goto err_pm_runtime;
> > +
> >  	pm_runtime_put(dev);
> >  
> >  	return 0;
> >  
> > +err_pm_runtime:
> > +	pm_runtime_dont_use_autosuspend(dev);
> > +	pm_runtime_disable(dev);
> > +
> >  err_deinit_iommu:
> >  	tegra_vde_iommu_deinit(vde);
> >  
> > @@ -1089,7 +1097,12 @@ static int tegra_vde_remove(struct platform_device *pdev)
> >  	struct tegra_vde *vde = platform_get_drvdata(pdev);
> >  	struct device *dev = &pdev->dev;
> >  
> > +	/*
> > +	 * As it increments RPM usage_count even on errors, we don't need to
> > +	 * check the returned code here.
> > +	 */
> >  	pm_runtime_get_sync(dev);
> > +
> >  	pm_runtime_dont_use_autosuspend(dev);
> >  	pm_runtime_disable(dev);
> >  
>