Much like we already have to_drm_output and to_drm_backend.

Signed-off-by: Daniel Stone <dani...@collabora.com>
---
 libweston/compositor-drm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index 2a72456d..3c75ec56 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -479,6 +479,12 @@ drm_output_pageflip_timer_create(struct drm_output *output)
        return 0;
 }
 
+static inline struct drm_mode *
+to_drm_mode(struct weston_mode *base)
+{
+       return container_of(base, struct drm_mode, base);
+}
+
 /**
  * Get the current value of a KMS property
  *
@@ -1788,7 +1794,7 @@ drm_output_apply_state(struct drm_output_state *state)
        assert(scanout_state->dest_w == scanout_state->src_w >> 16);
        assert(scanout_state->dest_h == scanout_state->src_h >> 16);
 
-       mode = container_of(output->base.current_mode, struct drm_mode, base);
+       mode = to_drm_mode(output->base.current_mode);
        if (backend->state_invalid || !scanout_plane->state_cur->fb ||
            scanout_plane->state_cur->fb->stride != scanout_state->fb->stride) {
                ret = drmModeSetCrtc(backend->drm.fd, output->crtc_id,
-- 
2.14.1

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