linux-kernel - Re: Re: [PATCH] media: staging: tegra-vde: fix runtime pm imbalance on error

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Message-ID: <20200521091505.GF30374@kadam>
Date:   Thu, 21 May 2020 12:15:05 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     dinghao.liu@....edu.cn
Cc:     devel@...verdev.osuosl.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org, kjlu@....edu,
        linux-kernel@...r.kernel.org,
        Jonathan Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Pavel Machek <pavel@....cz>, linux-tegra@...r.kernel.org,
        Dmitry Osipenko <digetx@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Subject: Re: Re: [PATCH] media: staging: tegra-vde: fix runtime pm imbalance
 on error

On Thu, May 21, 2020 at 11:42:55AM +0800, dinghao.liu@....edu.cn wrote:
> Hi, Dan,
> 
> I agree the best solution is to fix __pm_runtime_resume(). But there are also 
> many cases that assume pm_runtime_get_sync() will change PM usage 
> counter on error. According to my static analysis results, the number of these 
> "right" cases are larger. Adjusting __pm_runtime_resume() directly will introduce 
> more new bugs. Therefore I think we should resolve the "bug" cases individually.
> 

That's why I was saying that we may need to introduce a new replacement
function for pm_runtime_get_sync() that works as expected.

There is no reason why we have to live with the old behavior.

regards,
dan carpenter