drm/sti: fix potential crash in gdp

In some cases last_close() could be called before sti_gdp_disable()
and make kernel crash because mixer structure has been destroy.
Let's gdp keep a reference on vtg to fix that (like it is already done
in HQVDP)

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Vincent Abriou <vincent.abriou@st.com>

diff --git a/drivers/gpu/drm/sti/sti_gdp.c b/drivers/gpu/drm/sti/sti_gdp.c
index f9a1d92c9d9519c3ddbeefe33277f26af4f37a32..990b28ee3eac93351e5b121c06620a7b11304635 100644 (file)
--- a/drivers/gpu/drm/sti/sti_gdp.c
+++ b/drivers/gpu/drm/sti/sti_gdp.c
@@ -97,6 +97,7 @@ struct sti_gdp_node_list {
  * @vtg_field_nb:       callback for VTG FIELD (top or bottom) notification
  * @is_curr_top:        true if the current node processed is the top field
  * @node_list:          array of node list
+ * @vtg:                registered vtg
  */
 struct sti_gdp {
        struct sti_plane plane;
@@ -108,6 +109,7 @@ struct sti_gdp {
        struct notifier_block vtg_field_nb;
        bool is_curr_top;
        struct sti_gdp_node_list node_list[GDP_NODE_NB_BANK];
+       struct sti_vtg *vtg;
 };
 
 #define to_sti_gdp(x) container_of(x, struct sti_gdp, plane)
@@ -240,9 +242,6 @@ end:
  */
 static void sti_gdp_disable(struct sti_gdp *gdp)
 {
-       struct drm_plane *drm_plane = &gdp->plane.drm_plane;
-       struct sti_mixer *mixer = to_sti_mixer(drm_plane->crtc);
-       struct sti_compositor *compo = dev_get_drvdata(gdp->dev);
        unsigned int i;
 
        DRM_DEBUG_DRIVER("%s\n", sti_plane_to_str(&gdp->plane));
@@ -253,8 +252,7 @@ static void sti_gdp_disable(struct sti_gdp *gdp)
                gdp->node_list[i].btm_field->gam_gdp_ppt |= GAM_GDP_PPT_IGNORE;
        }
 
-       if (sti_vtg_unregister_client(mixer->id == STI_MIXER_MAIN ?
-                       compo->vtg_main : compo->vtg_aux, &gdp->vtg_field_nb))
+       if (sti_vtg_unregister_client(gdp->vtg, &gdp->vtg_field_nb))
                DRM_DEBUG_DRIVER("Warning: cannot unregister VTG notifier\n");
 
        if (gdp->clk_pix)
@@ -490,7 +488,10 @@ static void sti_gdp_atomic_update(struct drm_plane *drm_plane,
 
        if (first_prepare) {
                /* Register gdp callback */
-               if (sti_vtg_register_client(mixer->id == STI_MIXER_MAIN ?
+               gdp->vtg = mixer->id == STI_MIXER_MAIN ?
+                                       compo->vtg_main : compo->vtg_aux;
+
+               if (sti_vtg_register_client(gdp->vtg == STI_MIXER_MAIN ?
                                compo->vtg_main : compo->vtg_aux,
                                &gdp->vtg_field_nb, crtc)) {
                        DRM_ERROR("Cannot register VTG notifier\n");