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backend-drm: Skip testing plane state if plane is not enabled

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Adds a further assert() to make sure we're not checking against invalid
values. This was seen in the wild when the kernel rejects the commit for
overlay resulting in a check for invalid zpos values.

Fixes: #304

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
This commit is contained in:
Marius Vlad 2019-11-15 00:25:11 +02:00
parent bd002b9884
commit 788e80db77
1 changed files with 6 additions and 0 deletions
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6
libweston/backend-drm/state-propose.c
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@ -604,6 +604,12 @@ drm_output_check_zpos_plane_states(struct drm_output_state *state)
struct wl_list *next_node = ps->link.next;
bool found_dup = false;
/* skip any plane that is not enabled */
if (!ps->fb)
continue;
assert(ps->zpos != DRM_PLANE_ZPOS_INVALID_PLANE);
/* find another plane with the same zpos value */
if (next_node == &state->plane_list)
break;