From: dinghao.liu@zju.edu.cn
To: "Alain Volmat" <alain.volmat@st.com>
Cc: kjlu@umn.edu, "Pierre-Yves MORDRET" <pierre-yves.mordret@st.com>,
"Maxime Coquelin" <mcoquelin.stm32@gmail.com>,
"Alexandre Torgue" <alexandre.torgue@st.com>,
linux-i2c@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: Re: [PATCH] i2c: stm32f7: Fix runtime PM imbalance in stm32f7_i2c_reg_slave
Date: Tue, 26 May 2020 21:00:23 +0800 (GMT+08:00) [thread overview]
Message-ID: <7548c995.d205f.1725111d7c4.Coremail.dinghao.liu@zju.edu.cn> (raw)
In-Reply-To: <20200526083400.GC10725@gnbcxd0016.gnb.st.com>
> Overall, there are several other calls to pm_runtime_get_sync within this
> driver, would you like to fix them all at once ?
>
Sure, I will send a new patch to merge them all.
> On Thu, May 21, 2020 at 03:05:07PM +0800, Dinghao Liu wrote:
> > pm_runtime_get_sync() increments the runtime PM usage counter even
> > the call returns an error code. Thus a pairing decrement is needed
> > on the error handling path to keep the counter balanced.
> >
> > Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> > ---
> > drivers/i2c/busses/i2c-stm32f7.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> > index 330ffed011e0..602cf35649c8 100644
> > --- a/drivers/i2c/busses/i2c-stm32f7.c
> > +++ b/drivers/i2c/busses/i2c-stm32f7.c
> > @@ -1767,8 +1767,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
> > return ret;
> >
> > ret = pm_runtime_get_sync(dev);
> > - if (ret < 0)
> > + if (ret < 0) {
> > + pm_runtime_put_autosuspend(dev);
>
> Considering that if we fail here there is a very good chance that this is due
> to the resume failing, pm_runtime_put_noidle would probably make more sense
> since pm_runtime_put_autosuspend will most probably fail as well.
>
Agree. Thank you for your advice!
Regards.
Dinghao
next prev parent reply other threads:[~2020-05-26 13:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 7:05 [PATCH] i2c: stm32f7: Fix runtime PM imbalance in stm32f7_i2c_reg_slave Dinghao Liu
2020-05-26 8:34 ` Alain Volmat
2020-05-26 13:00 ` dinghao.liu [this message]
2020-05-26 13:25 ` Alain Volmat
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