Even though we were rolling our own custom state for the vc4 HDMI
controller driver, we were still using the generic helper to destroy
that state.

It was mostly working since the underlying state is the first member of
our state so the pointers are probably equal in all relevant cases, but
it's still fragile so let's fix this properly.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 25c9c71256d3..f05e2c95a60d 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -672,11 +672,21 @@ vc4_hdmi_connector_duplicate_state(struct drm_connector *connector)
 	return &new_state->base;
 }
 
+static void vc4_hdmi_connector_destroy_state(struct drm_connector *connector,
+					     struct drm_connector_state *state)
+{
+	struct vc4_hdmi_connector_state *vc4_state =
+		conn_state_to_vc4_hdmi_conn_state(state);
+
+	__drm_atomic_helper_connector_destroy_state(state);
+	kfree(vc4_state);
+}
+
 static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.reset = vc4_hdmi_connector_reset,
 	.atomic_duplicate_state = vc4_hdmi_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.atomic_destroy_state = vc4_hdmi_connector_destroy_state,
 	.atomic_get_property = vc4_hdmi_connector_get_property,
 	.atomic_set_property = vc4_hdmi_connector_set_property,
 };

-- 
2.43.0

On Thu, 7 Dec 2023 at 15:50, Maxime Ripard <mripard@kernel.org> wrote:
>
> Even though we were rolling our own custom state for the vc4 HDMI
> controller driver, we were still using the generic helper to destroy
> that state.
>
> It was mostly working since the underlying state is the first member of
> our state so the pointers are probably equal in all relevant cases, but
> it's still fragile so let's fix this properly.
>
> Signed-off-by: Maxime Ripard <mripard@kernel.org>

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 25c9c71256d3..f05e2c95a60d 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -672,11 +672,21 @@ vc4_hdmi_connector_duplicate_state(struct drm_connector *connector)
>         return &new_state->base;
>  }
>
> +static void vc4_hdmi_connector_destroy_state(struct drm_connector *connector,
> +                                            struct drm_connector_state *state)
> +{
> +       struct vc4_hdmi_connector_state *vc4_state =
> +               conn_state_to_vc4_hdmi_conn_state(state);
> +
> +       __drm_atomic_helper_connector_destroy_state(state);
> +       kfree(vc4_state);
> +}
> +
>  static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
>         .fill_modes = drm_helper_probe_single_connector_modes,
>         .reset = vc4_hdmi_connector_reset,
>         .atomic_duplicate_state = vc4_hdmi_connector_duplicate_state,
> -       .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +       .atomic_destroy_state = vc4_hdmi_connector_destroy_state,
>         .atomic_get_property = vc4_hdmi_connector_get_property,
>         .atomic_set_property = vc4_hdmi_connector_set_property,
>  };
>
> --
> 2.43.0
>

Hi Dave,

On Tue, Dec 12, 2023 at 11:40:26AM +0000, Dave Stevenson wrote:
> On Thu, 7 Dec 2023 at 15:50, Maxime Ripard <mripard@kernel.org> wrote:
> >
> > Even though we were rolling our own custom state for the vc4 HDMI
> > controller driver, we were still using the generic helper to destroy
> > that state.
> >
> > It was mostly working since the underlying state is the first member of
> > our state so the pointers are probably equal in all relevant cases, but
> > it's still fragile so let's fix this properly.
> >
> > Signed-off-by: Maxime Ripard <mripard@kernel.org>
> 
> Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

Thanks for the review, I've applied that patch now.

Could you also review the framework changes (patches 6 to 16) ?

Thanks!
Maxime

On Thu, 07 Dec 2023 16:49:41 +0100, Maxime Ripard wrote:
> Even though we were rolling our own custom state for the vc4 HDMI
> controller driver, we were still using the generic helper to destroy
> that state.
> 
> It was mostly working since the underlying state is the first member of
> our state so the pointers are probably equal in all relevant cases, but
> it's still fragile so let's fix this properly.
> 
> [...]

Applied to drm/drm-misc (drm-misc-next).

Thanks!
Maxime