linux-kernel - Re: [PATCH v2] drm/drm_vblank: Change EINVAL by the correct errno

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Message-ID: <20190114102920.h5guwpshzludwk2z@smtp.gmail.com>
Date:   Mon, 14 Jan 2019 08:29:20 -0200
From:   Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sean Paul <sean@...rly.run>, Dave Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] drm/drm_vblank: Change EINVAL by the correct errno

On 01/14, Maarten Lankhorst wrote:
> Op 13-01-2019 om 21:23 schreef Rodrigo Siqueira:
> > Hi,
> >
> > I resend this patch for CI via “intel-gfx@...ts.freedesktop.org” as
> > Daniel suggested, and I got a feedback that reported an issue as can be
> > seen here:
> >
> >    https://patchwork.freedesktop.org/series/51147/
> >
> > After a careful analysis of what happened, I concluded that the problem
> > is related to the function “igt_wait_for_vblank_count()” in “igt_kms.c”.
> > This function has the following assert:
> >
> >    igt_assert(drmWaitVBlank(drm_fd, &wait_vbl) == 0)
> >
> > This function only checks if everything went well with the
> > drmWaitVBlank() operation and does not make any other validation. IMHO
> > the patch is correct, and the problem pointed out by CI is not related
> > to this change.
> 
> Hey,

Hi,

Thanks for the feedback :)

> Thanks for finding the root cause. Before upstreaming can you send a fix for i-g-t so we don't lose CI coverage after changing the behavior?

I'm just confused on my next step, should I fix the IGT test and then
resend the patch? Additionally, I noticed that tests related to vblank
wait have others issues as I pointed out here (see my last message):

	https://patchwork.freedesktop.org/patch/245784/

Is it enough if I handling EINVAL and EOPNOTSUPP in the tests?  I'm
afraid, that the tests will still fail if I consider these two case;
however, I suppose that handling only EOPNOTSUPP can fix the problem,
but I'm not sure if it is the best solution.

Best Regards
 
> ~Maarten
>