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References: <20210430082744.3638743-1-narmstrong@baylibre.com>
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From:   Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Date:   Thu, 20 May 2021 22:25:45 +0200
Message-ID: <CAFBinCC0aaMUbBkJ4bjhFa0A+sZH1muyW6kqAQYfjjXOkrNPGg@mail.gmail.com>
Subject: Re: [PATCH] drm/meson: fix shutdown crash when component not probed
To:     Neil Armstrong <narmstrong@baylibre.com>
Cc:     dri-devel@lists.freedesktop.org, linux-amlogic@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Stefan Agner <stefan@agner.ch>
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Hi Neil,

since this has not received any Reviewed-by yet I tried my best to
review it myself

On Fri, Apr 30, 2021 at 10:28 AM Neil Armstrong <narmstrong@baylibre.com> wrote:
[...]
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -485,11 +485,12 @@ static int meson_probe_remote(struct platform_device *pdev,
>  static void meson_drv_shutdown(struct platform_device *pdev)
>  {
>         struct meson_drm *priv = dev_get_drvdata(&pdev->dev);
this part made it hard for me because I was wondering where the
matching dev_set_drvdata call is
it turns out platform_set_drvdata is used instead, meaning for me it
would have been easier to understand if platform_get_drvdata was used
here
that's however nothing which has changed with this patch

> -       struct drm_device *drm = priv->drm;
>
> -       DRM_DEBUG_DRIVER("\n");
> -       drm_kms_helper_poll_fini(drm);
> -       drm_atomic_helper_shutdown(drm);
> +       if (!priv)
> +               return;
> +
> +       drm_kms_helper_poll_fini(priv->drm);
> +       drm_atomic_helper_shutdown(priv->drm);
>  }
then this part finally made sense to me (as non-drm person), as
platform_set_drvdata comes near the end of meson_drv_bind_master (so
any errors would cause the drvdata to be NULL).

with this I can also give me:
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
in addition to my:
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Can you please queue this up for -fixes or do we need to ask someone to do it?


Best regards,
Martin