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backend/drm: ensure CRTC is set up in drm_connector_state_init()

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In [1] we discovered a bug where wlr_drm_connector_state.primary_fb
would not be set up correctly because drm_connector_alloc_crtc() was
called after drm_connector_state_init(). This is tricky to discover,
so instead assert() that we have a usable CRTC by the time
drm_connector_state_init() is called.

[1]: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4569
This commit is contained in:
Simon Ser 2024-03-04 14:07:12 +01:00 committed by Alexander Orzechowski
parent ba89b90a9c
commit c3743364e2
1 changed files with 15 additions and 10 deletions
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25
backend/drm/drm.c
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@ -544,22 +544,27 @@ static void drm_connector_state_init(struct wlr_drm_connector_state *state,
state->mode.type = DRM_MODE_TYPE_USERDEF;
}
if (conn->crtc != NULL) {
if (output_pending_enabled(&conn->output, base)) {
// The CRTC must be set up before this function is called
assert(conn->crtc != NULL);
struct wlr_drm_plane *primary = conn->crtc->primary;
if (primary->queued_fb != NULL) {
state->primary_fb = drm_fb_lock(primary->queued_fb);
} else if (primary->current_fb != NULL) {
state->primary_fb = drm_fb_lock(primary->current_fb);
}
}
if (conn->crtc != NULL && conn->cursor_enabled) {
struct wlr_drm_plane *cursor = conn->crtc->cursor;
if (conn->cursor_pending_fb != NULL) {
state->cursor_fb = drm_fb_lock(conn->cursor_pending_fb);
} else if (cursor->queued_fb != NULL) {
state->cursor_fb = drm_fb_lock(cursor->queued_fb);
} else if (cursor->current_fb != NULL) {
state->cursor_fb = drm_fb_lock(cursor->current_fb);
if (conn->cursor_enabled) {
struct wlr_drm_plane *cursor = conn->crtc->cursor;
assert(cursor != NULL);
if (conn->cursor_pending_fb != NULL) {
state->cursor_fb = drm_fb_lock(conn->cursor_pending_fb);
} else if (cursor->queued_fb != NULL) {
state->cursor_fb = drm_fb_lock(cursor->queued_fb);
} else if (cursor->current_fb != NULL) {
state->cursor_fb = drm_fb_lock(cursor->current_fb);
}
}
}
}