linux-kernel - Re: [linux-sunxi] [PATCH] drm/sun4i: Unbind components before releasing DRM and mem at master unbind

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Message-ID: <CAGb2v65n2KVUi8YQoo92bQAWUehzMisahah28VtQoJZd3WbC6w@mail.gmail.com>
Date:   Tue, 23 Apr 2019 10:14:34 -0700
From:   Chen-Yu Tsai <wens@...e.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [linux-sunxi] [PATCH] drm/sun4i: Unbind components before
 releasing DRM and mem at master unbind

On Tue, Apr 23, 2019 at 10:06 AM Paul Kocialkowski
<paul.kocialkowski@...tlin.com> wrote:
>
> Hi,
>
> Le vendredi 19 avril 2019 à 19:10 +0200, Paul Kocialkowski a écrit :
> > Hi,
> >
> > On Fri, 2019-04-19 at 09:02 -0700, Chen-Yu Tsai wrote:
> > > On Fri, Apr 19, 2019 at 1:03 AM Paul Kocialkowski
> > > <paul.kocialkowski@...tlin.com> wrote:
> > > > Our components may still be using the DRM device driver (if only to
> > > > access our driver's private data), so make sure to unbind them before
> > > > the final drm_dev_put.
> > > >
> > > > Also release our resserved memory adter unbind to match reverse
> > >
> > > typos...
> >
> > I'll probably spin up a v2 to fix them, they annoy me as well.
> >
> > > > creation order.
> > > >
> > > > Fixes: f5a9ed867c83 ("drm/sun4i: Fix component unbinding and component master deletion")
> > > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > > > ---
> > > >  drivers/gpu/drm/sun4i/sun4i_drv.c | 5 +++--
> > > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
> > > > index 843b86661833..29258b404e54 100644
> > > > --- a/drivers/gpu/drm/sun4i/sun4i_drv.c
> > > > +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
> > > > @@ -149,10 +149,11 @@ static void sun4i_drv_unbind(struct device *dev)
> > > >         drm_kms_helper_poll_fini(drm);
> > > >         drm_atomic_helper_shutdown(drm);
> > > >         drm_mode_config_cleanup(drm);
> > > > -       of_reserved_mem_device_release(dev);
> > > > -       drm_dev_put(drm);
> > > >
> > > >         component_unbind_all(dev, NULL);
> > > > +       of_reserved_mem_device_release(dev);
> > >
> > > You should probably mention this change in the commit log as well.
> >
> > That's what I meant with the line that has typos. Maybe I should make
> > it slightly more explicit as:
> >
> > Also released our reserved memory after component unbind instead of
> > before to match reverse creation order.
> >
> > What do you think?

Forgot to reply ...

Looking again, the original already made sense. I'm not sure what I
was doing ...

> > > Otherwise,
> > >
> > > Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> >
> > Thanks for the review!
>
> Unless you have objections at this point, I'll send out the patch with
> your Reviewed-by soon to get the patch out ASAP.

Works for me. Thanks!

ChenYu

> Cheers,
>
> Paul
>
> > Cheers,
> >
> > Paul
> >
> > > > +
> > > > +       drm_dev_put(drm);
> > > >  }
> > > >
> > > >  static const struct component_master_ops sun4i_drv_master_ops = {
> > > > --
> > > > 2.21.0
> > > >
> > > > --
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>
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