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

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Message-ID: <41c94d93321b10ee9173e0b5bce9bc37a1ea7532.camel@bootlin.com>
Date:   Tue, 23 Apr 2019 19:06:52 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
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

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?
> 
> > 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.

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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