From: "Rui Miguel Silva" <rmfrfs@gmail.com>
To: "Jonathan Cameron" <Jonathan.Cameron@Huawei.com>,
"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>
Cc: <linuxarm@huawei.com>, <mauro.chehab@huawei.com>,
"Fabio Estevam" <festevam@gmail.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"NXP Linux Team" <linux-imx@nxp.com>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Shawn Guo" <shawnguo@kernel.org>,
"Steve Longerbeam" <slongerbeam@gmail.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-media@vger.kernel.org>,
<linux-staging@lists.linux.dev>
Subject: Re: [PATCH 02/25] staging: media: imx7-mipi-csis: fix pm_runtime_get_sync() usage count
Date: Wed, 05 May 2021 14:56:40 +0100 [thread overview]
Message-ID: <CB5D4B64QTP4.GBH80G3VX3B6@arch-thunder> (raw)
In-Reply-To: <20210505120652.00001236@Huawei.com>
Hi,
On Wed May 5, 2021 at 12:06 PM WEST, Jonathan Cameron wrote:
> On Wed, 5 May 2021 11:41:52 +0200
> Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:
>
> > The pm_runtime_get_sync() internally increments the
> > dev->power.usage_count without decrementing it, even on errors.
> > Replace it by the new pm_runtime_resume_and_get(), introduced by:
> > commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> > in order to properly decrement the usage counter, avoiding
> > a potential PM usage counter leak.
> >
> > Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
>
> Not a fix as far as I can see, just a cleanup - so perhaps not this set?
yes, the original changelog of this patch, that I acked, made it
clear it was a cleanup:
"
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.
"
This one above is new, but I saw Mauro is going change it.
------
Cheers,
Rui
>
> Jonathan
>
>
> > ---
> > drivers/staging/media/imx/imx7-mipi-csis.c | 7 +++----
> > 1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> > index 025fdc488bd6..1dc680d94a46 100644
> > --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> > +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> > @@ -695,11 +695,10 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
> >
> > mipi_csis_clear_counters(state);
> >
> > - ret = pm_runtime_get_sync(&state->pdev->dev);
> > - if (ret < 0) {
> > - pm_runtime_put_noidle(&state->pdev->dev);
> > + ret = pm_runtime_resume_and_get(&state->pdev->dev);
> > + if (ret < 0)
> > return ret;
> > - }
> > +
> > ret = v4l2_subdev_call(state->src_sd, core, s_power, 1);
> > if (ret < 0 && ret != -ENOIOCTLCMD)
> > goto done;
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next prev parent reply other threads:[~2021-05-05 13:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-05 9:41 [PATCH 00/25] Fix some PM runtime issues at the media subsystem Mauro Carvalho Chehab
2021-05-05 9:41 ` [PATCH 02/25] staging: media: imx7-mipi-csis: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-05-05 11:06 ` Jonathan Cameron
2021-05-05 11:17 ` Mauro Carvalho Chehab
2021-05-05 13:56 ` Rui Miguel Silva [this message]
2021-05-05 14:23 ` Mauro Carvalho Chehab
2021-05-05 9:41 ` [PATCH 07/25] media: exynos-gsc: don't resume at remove time Mauro Carvalho Chehab
2021-05-05 12:27 ` Jonathan Cameron
2021-05-05 9:41 ` [PATCH 08/25] media: atmel: properly get pm_runtime Mauro Carvalho Chehab
2021-05-05 12:08 ` Jonathan Cameron
2021-06-10 9:04 ` Eugen.Hristev
2021-06-10 9:38 ` Mauro Carvalho Chehab
2021-06-10 12:00 ` Eugen.Hristev
2021-06-16 8:03 ` Mauro Carvalho Chehab
2021-09-06 8:03 ` Mauro Carvalho Chehab
2021-09-06 8:13 ` Eugen.Hristev
2021-09-13 10:26 ` Eugen.Hristev
2021-05-05 9:42 ` [PATCH 11/25] media: mdk-mdp: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-05-05 9:42 ` [PATCH 18/25] media: mtk-vcodec: fix PM runtime get logic Mauro Carvalho Chehab
2021-05-05 12:32 ` Jonathan Cameron
2021-05-05 9:42 ` [PATCH 19/25] media: s5p-jpeg: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-05-05 12:33 ` Jonathan Cameron
2021-05-05 9:42 ` [PATCH 21/25] media: sunxi: " Mauro Carvalho Chehab
2021-05-05 9:42 ` [PATCH 23/25] media: exynos4-is: " Mauro Carvalho Chehab
2021-05-05 12:20 ` Jonathan Cameron
2021-05-05 9:42 ` [PATCH 24/25] media: exynos-gsc: " Mauro Carvalho Chehab
2021-05-05 12:34 ` Jonathan Cameron
2021-05-06 15:11 ` [PATCH 00/25] Fix some PM runtime issues at the media subsystem Mauro Carvalho Chehab
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