linux-kernel - Re: [PATCH v3 00/14] staging: media: zoran: fusion in one module

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Message-ID: <YZO8an3L6gay0isM@Red>
Date:   Tue, 16 Nov 2021 15:12:58 +0100
From:   LABBE Corentin <clabbe@...libre.com>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     mchehab@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, mjpeg-users@...ts.sourceforge.net
Subject: Re: [PATCH v3 00/14] staging: media: zoran: fusion in one module

Le Mon, Nov 08, 2021 at 09:21:22AM +0100, Hans Verkuil a écrit :
> On 07/11/2021 17:35, LABBE Corentin wrote:
> > Le Wed, Nov 03, 2021 at 05:29:46PM +0100, Hans Verkuil a écrit :
> >> On 03/11/2021 16:57, LABBE Corentin wrote:
> >>> Le Wed, Nov 03, 2021 at 04:21:02PM +0100, Hans Verkuil a écrit :
> >>>> Hi Corentin,
> >>>>
> >>>> On 26/10/2021 21:34, Corentin Labbe wrote:
> >>>>> Hello
> >>>>>
> >>>>> The main change of this serie is to fusion all zoran related modules in
> >>>>> one.
> >>>>> This fixes the load order problem when everything is built-in.
> >>>>
> >>>> I've been testing this series, and while the module load/unload is now working,
> >>>> I'm running into a lot of other v4l2 compliance issues.
> >>>>
> >>>> I've fixed various issues in some follow-up patches available in my tree:
> >>>>
> >>>> https://git.linuxtv.org/hverkuil/media_tree.git/log/?h=zoran
> >>>>
> >>>> At least some of the worst offenders are now resolved. Note that the patch
> >>>> dropping read/write support relies on this patch:
> >>>>
> >>>> https://patchwork.linuxtv.org/project/linux-media/patch/4f89b139-13b7-eee6-9662-996626b778b0@xs4all.nl/
> >>>
> >>> Hello
> >>>
> >>> My test branch already included your "zoran: fix various V4L2 compliance errors"
> >>> I have quickly checked other patch and I am ok with them.
> >>> I will add and test with them.
> >>>
> >>>>
> >>>> But there is one really major bug that makes me hesitant to merge this:
> >>>>
> >>>> This works:
> >>>>
> >>>> v4l2-ctl -v pixelformat=MJPG,width=768,height=576
> >>>> v4l2-ctl --stream-mmap
> >>>>
> >>>> This fails:
> >>>>
> >>>> v4l2-ctl -v pixelformat=MJPG,width=768,height=288
> >>>> v4l2-ctl --stream-mmap
> >>>>
> >>>> It's an immediate lock up with nothing to indicate what is wrong.
> >>>> As soon as the height is 288 or less, this happens.
> >>>>
> >>>> Both with my DC30 and DC30D.
> >>>
> >>> Just for curiosity, what is the difference between thoses two ?
> >>
> >> It's the DC30 variant without an adv7175.
> >>
> >>>
> >>>>
> >>>> Do you see the same? Any idea what is going on? I would feel much happier
> >>>> if this is fixed.
> >>>>
> >>>> Note that the same problem is present without this patch series, so it's
> >>>> been there for some time.
> >>>>
> >>>
> >>> I will start on digging this problem and add thoses commands to my CI.
> >>> And I know there are a huge quantity of problem since origins.
> >>> A simple example is that just setting MJPEG as default input format does not work.
> >>>
> >>> But since it is not related to my serie, can you please merge it.
> >>
> >> Before I do that, I would really like to know a bit more about this issue:
> >> can you reproduce it? Is it DC30 specific or a general problem with zoran?
> >>
> >> The problem with this hard hang is that it is hard to do regression testing
> >> with v4l2-compliance, since it will hang as soon as MJPG pixelformat is
> >> tested.
> >>
> >> I would feel much happier if the hang can be avoided, even if it is just
> >> with a temporary hack. It will make it much easier going forward.
> >>
> > 
> > I found the bug
> > 
> > The null pointer deref was in zoran_reap_stat_com() due to 
> > buf = zr->inuse[i];
> > ...
> > buf->vbuf.vb2_buf.timestamp = ktime_get_ns();
> > with buf = NULL;
> > 
> > It is due to miscalculation of "i".
> > 
> > I will resend my serie with the fix for that.
> 
> Excellent news! Thank you for tracking this one down.
> 
> When you post your series, can you include my patches from
> https://git.linuxtv.org/hverkuil/media_tree.git/log/?h=zoran as well?
> 

Hello

Yes, I will include them.

Regards