From: Jonathan Cameron <jic23@kernel.org>
To: "Nuno Sá" <noname.nuno@gmail.com>
Cc: "Andy Shevchenko" <andy.shevchenko@gmail.com>,
"Nuno Sá" <nuno.sa@analog.com>,
linux-amlogic@lists.infradead.org, linux-imx@nxp.com,
linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org,
"Heiko Stuebner" <heiko@sntech.de>,
"Martin Blumenstingl" <martin.blumenstingl@googlemail.com>,
"Neil Armstrong" <narmstrong@baylibre.com>,
"Shawn Guo" <shawnguo@kernel.org>,
"Lars-Peter Clausen" <lars@metafoo.de>,
"Jyoti Bhayana" <jbhayana@google.com>,
"Hans de Goede" <hdegoede@redhat.com>,
"Andriy Tryshnivskyy" <andriy.tryshnivskyy@opensynergy.com>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Miquel Raynal" <miquel.raynal@bootlin.com>,
"Cixi Geng" <cixi.geng1@unisoc.com>,
"Baolin Wang" <baolin.wang@linux.alibaba.com>,
"Ciprian Regus" <ciprian.regus@analog.com>,
"Fabio Estevam" <festevam@gmail.com>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Alexandru Ardelean" <aardelean@deviqon.com>,
"Florian Boor" <florian.boor@kernelconcepts.de>,
"Michael Hennerich" <Michael.Hennerich@analog.com>,
"Orson Zhai" <orsonzhai@gmail.com>,
"Chen-Yu Tsai" <wens@csie.org>,
"Chunyan Zhang" <zhang.lyra@gmail.com>,
"Vladimir Zapolskiy" <vz@mleia.com>,
"Jerome Brunet" <jbrunet@baylibre.com>,
"Haibo Chen" <haibo.chen@nxp.com>,
"Kevin Hilman" <khilman@baylibre.com>
Subject: Re: [PATCH v2 14/16] iio: health: max30100: do not use internal iio_dev lock
Date: Sun, 9 Oct 2022 13:14:26 +0100 [thread overview]
Message-ID: <20221009131426.77f4697f@jic23-huawei> (raw)
In-Reply-To: <0bad9d1ef45d0a85b7d25a4ee50914ea93936bb2.camel@gmail.com>
On Wed, 05 Oct 2022 10:09:29 +0200
Nuno Sá <noname.nuno@gmail.com> wrote:
> On Tue, 2022-10-04 at 17:13 +0300, Andy Shevchenko wrote:
> > On Tue, Oct 4, 2022 at 4:49 PM Nuno Sá <nuno.sa@analog.com> wrote:
> > >
> > > The pattern used in this device does not quite fit in the
> > > iio_device_claim_direct_mode() typical usage. In this case,
> > > iio_buffer_enabled() was being used not to prevent the raw access
> > > but to
> > > allow it. Hence, let's make use of the new
> > > iio_device_claim_buffer_mode() API to make sure we stay in buffered
> > > mode
> > > during the complete read.
> >
> > ...
> >
> > > + if (iio_device_claim_buffer_mode(indio_dev)) {
> > > ret = -EAGAIN;
> >
> > Why is the error code shadowed? Isn't it better to return exactly the
> > one you resend to the upper caller(s)? Each unclear error code
> > shadowing should be at least explained.
> > > }
>
> I'm keeping the same error that was returned before. Changing the error
> code returned to userspace can break some apps relying on it. But if
> everyone is ok with assuming the risk and changing it, fine by me.
Hmm. For most drivers I'd say change it, but these weird health parts
use a highly custom userspace so it's just possible we'd break it
by changing the return code. Unfortunately I don't know of anyone with current
access to the code of that software stack to check this for us as
there have been a lot of changes at TI in recent years.
So probably best to leave it alone, but add a comment to the patch description
to give reasoning.
Thanks,
Jonathan
>
>
> - Nuno Sá
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-10-09 12:15 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-04 13:48 [PATCH v2 00/16] Make 'mlock' really private Nuno Sá
2022-10-04 13:48 ` [PATCH v2 01/16] iio: adc: ad799x: do not use internal iio_dev lock Nuno Sá
2022-10-09 11:53 ` Jonathan Cameron
2022-10-04 13:48 ` [PATCH v2 02/16] iio: adc: axp288_adc: " Nuno Sá
2022-10-09 11:55 ` Jonathan Cameron
2022-10-04 13:48 ` [PATCH v2 03/16] iio: adc: imx7d_adc: " Nuno Sá
2022-10-09 2:00 ` Bough Chen
2022-10-09 11:56 ` Jonathan Cameron
2022-10-04 13:48 ` [PATCH v2 04/16] iio: adc: lpc32xx_adc: " Nuno Sá
2022-10-09 11:57 ` Jonathan Cameron
2022-10-04 13:48 ` [PATCH v2 05/16] iio: adc: ltc2947-core: " Nuno Sá
2022-10-09 11:58 ` Jonathan Cameron
2022-10-04 13:48 ` [PATCH v2 06/16] iio: adc: meson_saradc: " Nuno Sá
2022-10-09 12:01 ` Jonathan Cameron
2022-10-04 13:49 ` [PATCH v2 07/16] iio: adc: rockchip_saradc: " Nuno Sá
2022-10-05 7:44 ` Heiko Stübner
2022-10-09 12:03 ` Jonathan Cameron
2022-10-04 13:49 ` [PATCH v2 08/16] iio: adc: sc27xx_adc: " Nuno Sá
2022-10-09 12:05 ` Jonathan Cameron
2022-10-04 13:49 ` [PATCH v2 09/16] iio: adc: vf610_adc: add helper function to read samples Nuno Sá
2022-10-09 2:10 ` Bough Chen
2022-10-04 13:49 ` [PATCH v2 10/16] iio: adc: vf610_adc: vf610_adc: do not use internal iio_dev lock Nuno Sá
2022-10-09 2:10 ` Bough Chen
2022-10-04 13:49 ` [PATCH v2 11/16] iio: common: scmi_iio: " Nuno Sá
2022-10-09 12:09 ` Jonathan Cameron
2022-10-04 13:49 ` [PATCH v2 12/16] iio: gyro: itg3200_core: " Nuno Sá
2022-10-09 12:10 ` Jonathan Cameron
2022-10-04 13:49 ` [PATCH v2 13/16] iio: core: introduce iio_device_{claim|release}_buffer_mode() APIs Nuno Sá
2022-10-04 14:08 ` Andy Shevchenko
2022-10-05 8:37 ` Nuno Sá
2022-10-09 11:41 ` Jonathan Cameron
2022-10-10 7:03 ` Nuno Sá
2022-10-04 13:49 ` [PATCH v2 14/16] iio: health: max30100: do not use internal iio_dev lock Nuno Sá
2022-10-04 14:13 ` Andy Shevchenko
2022-10-05 8:09 ` Nuno Sá
2022-10-09 12:14 ` Jonathan Cameron [this message]
2022-10-04 13:49 ` [PATCH v2 15/16] iio: health: max30102: " Nuno Sá
2022-10-04 14:15 ` Andy Shevchenko
2022-10-05 8:17 ` Nuno Sá
2022-10-09 11:44 ` Jonathan Cameron
2022-10-09 12:16 ` Jonathan Cameron
2022-10-10 7:08 ` Nuno Sá
2022-10-04 13:49 ` [PATCH v2 16/16] iio: core: move 'mlock' to 'struct iio_dev_opaque' Nuno Sá
2022-10-04 14:21 ` Andy Shevchenko
2022-10-05 8:40 ` Nuno Sá
2022-10-09 11:48 ` Jonathan Cameron
2022-10-09 11:52 ` Jonathan Cameron
2022-10-10 8:30 ` Andy Shevchenko
2022-10-09 12:19 ` Jonathan Cameron
2022-10-10 7:11 ` Nuno Sá
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221009131426.77f4697f@jic23-huawei \
--to=jic23@kernel.org \
--cc=Michael.Hennerich@analog.com \
--cc=aardelean@deviqon.com \
--cc=andriy.tryshnivskyy@opensynergy.com \
--cc=andy.shevchenko@gmail.com \
--cc=baolin.wang@linux.alibaba.com \
--cc=ciprian.regus@analog.com \
--cc=cixi.geng1@unisoc.com \
--cc=festevam@gmail.com \
--cc=florian.boor@kernelconcepts.de \
--cc=haibo.chen@nxp.com \
--cc=hdegoede@redhat.com \
--cc=heiko@sntech.de \
--cc=jbhayana@google.com \
--cc=jbrunet@baylibre.com \
--cc=kernel@pengutronix.de \
--cc=khilman@baylibre.com \
--cc=lars@metafoo.de \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-imx@nxp.com \
--cc=linux-rockchip@lists.infradead.org \
--cc=martin.blumenstingl@googlemail.com \
--cc=miquel.raynal@bootlin.com \
--cc=narmstrong@baylibre.com \
--cc=noname.nuno@gmail.com \
--cc=nuno.sa@analog.com \
--cc=orsonzhai@gmail.com \
--cc=s.hauer@pengutronix.de \
--cc=shawnguo@kernel.org \
--cc=vz@mleia.com \
--cc=wens@csie.org \
--cc=zhang.lyra@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).