Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20190418132727.5128-1-paul.kocialkowski@bootlin.com> <20190418132727.5128-4-paul.kocialkowski@bootlin.com>
In-Reply-To: <20190418132727.5128-4-paul.kocialkowski@bootlin.com>
From:   Chen-Yu Tsai <wens@csie.org>
Date:   Thu, 18 Apr 2019 08:03:42 -0700
Message-ID: <CAGb2v67MYXQsdv7E_SGXALVVr0T7aTTP6AhwA3N8U7HNJkRH7w@mail.gmail.com>
Subject: Re: [linux-sunxi] [PATCH 3/3] drm/sun4i: Fix component unbinding and
 component master deletion
To:     Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Cc:     dri-devel <dri-devel@lists.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-sunxi <linux-sunxi@googlegroups.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Apr 18, 2019 at 6:27 AM Paul Kocialkowski
<paul.kocialkowski@bootlin.com> wrote:
>
> For our component-backed driver to be properly removed, we need to
> delete the component master in sun4i_drv_remove and make sure to call
> component_unbind_all in the master's unbind so that all components are
> unbound when the master is.
>
> Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_drv.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
> index af07291544a4..0ea365e54de1 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_drv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
> @@ -137,6 +137,8 @@ static void sun4i_drv_unbind(struct device *dev)
>         drm_mode_config_cleanup(drm);
>         of_reserved_mem_device_release(dev);
>         drm_dev_put(drm);
> +
> +       component_unbind_all(dev, NULL);

Shouldn't this be before drm_dev_put? Everything being in reverse order
of the complement calls in the bind function and all. The component
drivers might still be using the drm dev before they are unbound.

ChenYu

>  }
>
>  static const struct component_master_ops sun4i_drv_master_ops = {
> @@ -385,6 +387,8 @@ static int sun4i_drv_probe(struct platform_device *pdev)
>
>  static int sun4i_drv_remove(struct platform_device *pdev)
>  {
> +       component_master_del(&pdev->dev, &sun4i_drv_master_ops);
> +
>         return 0;
>  }
>
> --
> 2.21.0
>
> --
> You received this message because you are subscribed to the Google Groups "linux-sunxi" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.