linux-kernel - Re: [PATCH] [v3] i2c: imx-lpi2c: Fix runtime PM imbalance on error

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Message-ID: <20200615070613.GA1497@kunai>
Date:   Mon, 15 Jun 2020 09:06:13 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Aisheng Dong <aisheng.dong@....com>
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        "kjlu@....edu" <kjlu@....edu>,
        Markus Elfring <Markus.Elfring@....de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Andy Duan <fugang.duan@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [v3] i2c: imx-lpi2c: Fix runtime PM imbalance on error

On Mon, Jun 15, 2020 at 06:33:40AM +0000, Aisheng Dong wrote:
> > From: Wolfram Sang <wsa@...nel.org>
> > Sent: Sunday, June 14, 2020 5:12 PM
> > 
> > On Mon, Jun 01, 2020 at 02:16:40PM +0800, Dinghao Liu wrote:
> > > pm_runtime_get_sync() increments the runtime PM usage counter even the
> > > call returns an error code. Thus a corresponding decrement is needed
> > > on the error handling path to keep the counter balanced.
> > 
> > Can you point me to a discussion where it was decided that this is a proper fix?
> > I'd think we rather should fix pm_runtime_get_sync() but maybe there are
> > technical reasons against it.
> 
> I had the same feeling.
> Copy pm guys to comments.

I started a seperate thread:

https://lkml.org/lkml/2020/6/14/76

Still, on-going discussion if the proper fix is to remove the error
check.


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