linux-kernel - Re: [PATCH v3 25/79] staging: media: vde: use pm_runtime_resume_and

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Message-ID: <20210428092043.380c9d4c@coco.lan>
Date:   Wed, 28 Apr 2021 09:20:43 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.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 v3 25/79] staging: media: vde: use
 pm_runtime_resume_and_get()

Em Tue, 27 Apr 2021 14:47:01 +0300
Dmitry Osipenko <digetx@...il.com> escreveu:

> 27.04.2021 13:26, Mauro Carvalho Chehab пишет:
> > @@ -1088,8 +1090,9 @@ static int tegra_vde_remove(struct platform_device *pdev)
> >  {
> >  	struct tegra_vde *vde = platform_get_drvdata(pdev);
> >  	struct device *dev = &pdev->dev;
> > +	int ret;
> >  
> > -	pm_runtime_get_sync(dev);
> > +	ret = pm_runtime_resume_and_get(dev);  
> 
> Should be cleaner to return error directly here, IMO.

I double-checked how drivers/base/platform.c deals with non-zero
returns at the .remove method:

	static int platform_remove(struct device *_dev)
	{
	        struct platform_driver *drv = to_platform_driver(_dev->driver);
	        struct platform_device *dev = to_platform_device(_dev);
	
	        if (drv->remove) {
	                int ret = drv->remove(dev);
	
	                if (ret)
	                        dev_warn(_dev, "remove callback returned a non-zero value. This will be ignored.\n");
	        }
	        dev_pm_domain_detach(_dev, true);
	
	        return 0;
	}

Basically, it will print a message but will ignore whatever happens
afterwards.

So, if the driver is changed to return an error there, it will leak
resources.

Thanks,
Mauro