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Date: Tue, 16 Apr 2024 09:59:10 +0200 (CEST)
From: Julia Lawall <julia.lawall@inria.fr>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
cc: =?ISO-8859-15?Q?Niklas_S=F6derlund?= <niklas.soderlund+renesas@ragnatech.se>, 
    Ricardo Ribalda <ribalda@chromium.org>, 
    Julia Lawall <Julia.Lawall@inria.fr>, 
    Martin Tuma <martin.tuma@digiteqautomotive.com>, 
    Mauro Carvalho Chehab <mchehab@kernel.org>, 
    Hans Verkuil <hverkuil-cisco@xs4all.nl>, 
    Hugues Fruchet <hugues.fruchet@foss.st.com>, 
    Alain Volmat <alain.volmat@foss.st.com>, 
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    Alexandre Torgue <alexandre.torgue@foss.st.com>, 
    Paul Kocialkowski <paul.kocialkowski@bootlin.com>, 
    Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 
    Chen-Yu Tsai <wens@csie.org>, Jernej Skrabec <jernej.skrabec@gmail.com>, 
    Samuel Holland <samuel@sholland.org>, 
    Sakari Ailus <sakari.ailus@linux.intel.com>, 
    Thierry Reding <thierry.reding@gmail.com>, 
    Jonathan Hunter <jonathanh@nvidia.com>, 
    Sowjanya Komatineni <skomatineni@nvidia.com>, 
    Luca Ceresoli <luca.ceresoli@bootlin.com>, 
    Matthias Brugger <matthias.bgg@gmail.com>, 
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    Hans Verkuil <hverkuil@xs4all.nl>, Sergey Kozlov <serjk@netup.ru>, 
    Abylay Ospan <aospan@netup.ru>, 
    Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>, 
    Dmitry Osipenko <digetx@gmail.com>, 
    Stanimir Varbanov <stanimir.k.varbanov@gmail.com>, 
    Vikash Garodia <quic_vgarodia@quicinc.com>, 
    Bryan O'Donoghue <bryan.odonoghue@linaro.org>, 
    Bjorn Andersson <andersson@kernel.org>, 
    Konrad Dybcio <konrad.dybcio@linaro.org>, 
    Benjamin Mugnier <benjamin.mugnier@foss.st.com>, 
    Sylvain Petinot <sylvain.petinot@foss.st.com>, 
    Jacopo Mondi <jacopo+renesas@jmondi.org>, 
    Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>, 
    Pavel Machek <pavel@ucw.cz>, linux-media@vger.kernel.org, 
    linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, 
    linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev, 
    linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, 
    linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH 00/35] media: Fix coccinelle warning/errors
In-Reply-To: <20240416070843.GA31419@pendragon.ideasonboard.com>
Message-ID: <4d8ea4c-ed5b-903d-a041-69c3cdd82d64@inria.fr>
References: <20240415-fix-cocci-v1-0-477afb23728b@chromium.org> <20240415195348.GD22954@pendragon.ideasonboard.com> <CANiDSCteGngbSS6CCuUxM-PQiBz0W0WfoFr2E2oH2d8qt746_A@mail.gmail.com> <20240415203304.GA3460978@ragnatech.se>
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On Tue, 16 Apr 2024, Laurent Pinchart wrote:

> On Mon, Apr 15, 2024 at 11:38:46PM +0200, Niklas Söderlund wrote:
> > On 2024-04-15 23:16:55 +0200, Ricardo Ribalda wrote:
> > > On Mon, 15 Apr 2024 at 22:33, Niklas Söderlund wrote:
> > > > On 2024-04-15 21:58:58 +0200, Ricardo Ribalda wrote:
> > > > > On Mon, 15 Apr 2024 at 21:54, Laurent Pinchart wrote:
> > > > > >
> > > > > > Hi Ricardo,
> > > > > >
> > > > > > I'm afraid I won't have time to review any of this for the time being.
> > > > > > Unless you would like me to put uvcvideo reviews on hold ;-)
> > > > > >
> > > > > > Jokes aside, my first reaction was that this feels like a bit of a waste
> > > > > > of maintainer's time :-S
> > > > >
> > > > > This is part of the media-ci effort.
>
> Ah. Mentioning that in the cover letter would have helped.
>
> > > > > It is definitely not the most fun patches to do or review, but someone
> > > > > has to do it :)
> > > > >
> > > > > The whole idea is that we want to get as little warnings as possible
> > > > > from the static analysers, after this patchset we almost achieve that.
> > > >
> > > > I understand and I think it's a good goal to aim for zero warnings. But
> > > > some of the fixes here are IMHO not helpful, for example I find this
> > > > type of change counter productive.
> > > >
> > > > -       return ret < 0 ? ret : 0;
> > > > +
> > > > +       if (ret < 0)
> > > > +               return ret;
> > > > +       return 0;
> > >
> > > I was on the edge on those ones as well...
> > >
> > > Maybe we can try to fix the .cocci file to ignore that pattern?
> > > https://lore.kernel.org/lkml/20240415-minimax-v1-1-5feb20d66a79@chromium.org/T/#u
> >
> > Thanks for looking into it! I think this is a good idea.
>
> I agree, this is the first type of change I saw in the series, and it
> made me dispair for a moment :-)
>
> > > > Maybe it's better to disable this type of checks in the linter?

I would be happy to get rid of it.  The person who made the semantic patch
originally expressed the opinion that maybe it could be useful sometimes,
but I always discard these patches when 0-day forwards them to me for
approval.

When it's not a 0 value, using min and max can often improve readability,
so I think it would be unfortunate to remove the semantic patch
completely.

julia


> > > >
> > > > > It is only 2 trivial uvc patches, I can ask someone from my team to
> > > > > review it if you want and trust them ;)
> > > > >
> > > > > Regards!
> > > > >
> > > > > > On Mon, Apr 15, 2024 at 07:34:17PM +0000, Ricardo Ribalda wrote:
> > > > > > > After this set is applied, these are the only warnings left:
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:223:4-10: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:230:3-9: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:236:4-10: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:245:3-9: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:251:3-9: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:257:3-9: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:272:3-9: preceding lock on line 267
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:598:4-10: preceding lock on line 627
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:598:4-10: preceding lock on line 689
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:606:3-9: preceding lock on line 627
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:606:3-9: preceding lock on line 689
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:648:3-9: preceding lock on line 627
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:648:3-9: preceding lock on line 689
> > > > > > > drivers/media/pci/ivtv/ivtv-fileops.c:692:4-10: preceding lock on line 689
> > > > > > > drivers/media/dvb-core/dvb_frontend.c:2897:1-7: preceding lock on line 2776
> > > > > > > drivers/media/dvb-core/dvb_frontend.c:2897:1-7: preceding lock on line 2786
> > > > > > > drivers/media/dvb-core/dvb_frontend.c:2897:1-7: preceding lock on line 2809
> > > > > > > drivers/media/dvb-frontends/stv090x.c:799:1-7: preceding lock on line 768
> > > > > > > drivers/media/usb/go7007/go7007-i2c.c:125:1-7: preceding lock on line 61
> > > > > > > drivers/media/rc/imon.c:1167:1-7: preceding lock on line 1153
> > > > > > > drivers/media/pci/cx18/cx18-scb.h:261:22-29: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:77:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:85:5-16: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:154:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:171:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:180:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:189:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:201:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:220:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_cmds.h:230:5-16: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:764:5-15: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1008:43-60: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1014:36-46: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1041:5-15: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1088:39-51: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1093:5-22: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1144:4-8: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1239:4-8: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1267:5-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/qcom/venus/hfi_helper.h:1272:4-13: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/common/siano/smscoreapi.h:619:5-13: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/common/siano/smscoreapi.h:669:6-13: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/common/siano/smscoreapi.h:1049:4-8: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/common/siano/smscoreapi.h:1055:4-8: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/dvb-frontends/mxl5xx_defs.h:171:4-8: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/dvb-frontends/mxl5xx_defs.h:182:4-8: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/allegro-dvt/nal-hevc.h:102:14-22: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/media/platform/xilinx/xilinx-dma.h:100:19-22: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > > drivers/staging/media/atomisp/pci/atomisp_tpg.h:30:18-22: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
> > > > > > >
> > > > > > > CI tested:
> > > > > > > https://gitlab.freedesktop.org/linux-media/media-staging/-/commit/055b5211c68e721c3a7090be5373cf44859da1a7/pipelines?ref=ribalda%2Ftest-cocci
> > > > > > >
> > > > > > > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > > > > > > ---
> > > > > > > Ricardo Ribalda (35):
> > > > > > >       media: pci: mgb4: Refactor struct resources
> > > > > > >       media: stb0899: Remove unreacheable code
> > > > > > >       media: uvcvideo: Refactor iterators
> > > > > > >       media: uvcvideo: Use max() macro
> > > > > > >       media: go7007: Use min and max macros
> > > > > > >       media: stm32-dcmipp: Remove redundant printk
> > > > > > >       media: staging: sun6i-isp: Remove redundant printk
> > > > > > >       media: dvb-frontends: tda18271c2dd: Remove casting during div
> > > > > > >       media: v4l: async: refactor v4l2_async_create_ancillary_links
> > > > > > >       staging: media: tegra-video: Use swap macro
> > > > > > >       media: s2255: Use refcount_t instead of atomic_t for num_channels
> > > > > > >       media: platform: mtk-mdp3: Use refcount_t for job_count
> > > > > > >       media: common: saa7146: Use min macro
> > > > > > >       media: dvb-frontends: drx39xyj: Use min macro
> > > > > > >       media: netup_unidvb: Use min macro
> > > > > > >       media: au0828: Use min macro
> > > > > > >       media: flexcop-usb: Use min macro
> > > > > > >       media: gspca: cpia1: Use min macro
> > > > > > >       media: stk1160: Use min macro
> > > > > > >       media: tegra-vde: Refactor timeout handling
> > > > > > >       media: venus: Use div64_u64
> > > > > > >       media: i2c: st-mipid02: Use the correct div function
> > > > > > >       media: dvb-frontends: tda10048: Use the right div
> > > > > > >       media: tc358746: Use the correct div_ function
> > > > > > >       media: venus: Use the correct div_ function
> > > > > > >       media: venus: Refator return path
> > > > > > >       media: dib0700: Refator return path
> > > > > > >       media: usb: cx231xx: Refator return path
> > > > > > >       media: i2c: rdacm20: Refator return path
> > > > > > >       media: i2c: et8ek8: Refator return path
> > > > > > >       media: cx231xx: Refator return path
> > > > > > >       media: si4713: Refator return path
> > > > > > >       media: ttpci: Refator return path
> > > > > > >       media: hdpvr: Refator return path
> > > > > > >       media: venus: Refator return path
> > > > > > >
> > > > > > >  drivers/media/common/saa7146/saa7146_hlp.c         |  8 +++----
> > > > > > >  drivers/media/dvb-frontends/drx39xyj/drxj.c        |  9 +++-----
> > > > > > >  drivers/media/dvb-frontends/stb0899_drv.c          |  5 -----
> > > > > > >  drivers/media/dvb-frontends/tda10048.c             |  3 +--
> > > > > > >  drivers/media/dvb-frontends/tda18271c2dd.c         |  4 ++--
> > > > > > >  drivers/media/i2c/et8ek8/et8ek8_driver.c           |  4 +++-
> > > > > > >  drivers/media/i2c/rdacm20.c                        |  5 ++++-
> > > > > > >  drivers/media/i2c/st-mipid02.c                     |  2 +-
> > > > > > >  drivers/media/i2c/tc358746.c                       |  3 +--
> > > > > > >  drivers/media/pci/mgb4/mgb4_core.c                 |  4 ++--
> > > > > > >  drivers/media/pci/mgb4/mgb4_regs.c                 |  2 +-
> > > > > > >  drivers/media/pci/netup_unidvb/netup_unidvb_i2c.c  |  2 +-
> > > > > > >  drivers/media/pci/ttpci/budget-core.c              |  5 ++++-
> > > > > > >  .../media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c   | 10 ++++-----
> > > > > > >  .../media/platform/mediatek/mdp3/mtk-mdp3-core.c   |  6 ++---
> > > > > > >  .../media/platform/mediatek/mdp3/mtk-mdp3-core.h   |  2 +-
> > > > > > >  .../media/platform/mediatek/mdp3/mtk-mdp3-m2m.c    |  6 ++---
> > > > > > >  drivers/media/platform/nvidia/tegra-vde/h264.c     |  6 ++---
> > > > > > >  drivers/media/platform/qcom/venus/vdec.c           | 15 +++++++------
> > > > > > >  drivers/media/platform/qcom/venus/venc.c           | 19 +++++++++-------
> > > > > > >  .../platform/st/stm32/stm32-dcmipp/dcmipp-core.c   |  5 +----
> > > > > > >  drivers/media/radio/si4713/radio-usb-si4713.c      |  8 +++++--
> > > > > > >  drivers/media/usb/au0828/au0828-video.c            |  5 +----
> > > > > > >  drivers/media/usb/b2c2/flexcop-usb.c               |  5 +----
> > > > > > >  drivers/media/usb/cx231xx/cx231xx-i2c.c            | 16 +++++++++----
> > > > > > >  drivers/media/usb/cx231xx/cx231xx-video.c          | 10 +++++++--
> > > > > > >  drivers/media/usb/dvb-usb/dib0700_core.c           |  4 +++-
> > > > > > >  drivers/media/usb/go7007/go7007-fw.c               |  4 ++--
> > > > > > >  drivers/media/usb/gspca/cpia1.c                    |  6 ++---
> > > > > > >  drivers/media/usb/hdpvr/hdpvr-control.c            |  4 +++-
> > > > > > >  drivers/media/usb/s2255/s2255drv.c                 | 20 ++++++++---------
> > > > > > >  drivers/media/usb/stk1160/stk1160-video.c          | 10 ++-------
> > > > > > >  drivers/media/usb/uvc/uvc_ctrl.c                   | 26 ++++++++++++----------
> > > > > > >  drivers/media/v4l2-core/v4l2-async.c               |  8 +++----
> > > > > > >  drivers/staging/media/sunxi/sun6i-isp/sun6i_isp.c  |  1 -
> > > > > > >  drivers/staging/media/tegra-video/tegra20.c        |  9 ++------
> > > > > > >  36 files changed, 132 insertions(+), 129 deletions(-)
> > > > > > > ---
> > > > > > > base-commit: 71b3ed53b08d87212fbbe51bdc3bf44eb8c462f8
> > > > > > > change-id: 20240415-fix-cocci-2df3ef22a6f7
> > > > > > >
> > > > > > > Best regards,
>
> --
> Regards,
>
> Laurent Pinchart
>
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