On Fri, Dec 04, 2015 at 09:46:03AM +0100, Daniel Vetter wrote:
> This can happen when we run out of encoders for a multi-crtc modeset,
> or also when userspace is silly and tries to clone multiple connectors
> that need the same encoder on the same crtc.
> 
> Reported-and-Tested-and-Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_atomic_helper.c | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 2cf8ab7dbc8c..ab275499d2a3 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -86,6 +86,27 @@ drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
>  	}
>  }
>  
> +static bool
> +check_pending_encoder_assignment(struct drm_atomic_state *state,
> +				 struct drm_encoder *new_encoder,
> +				 struct drm_connector *new_connector)

new_connector seems to be unused.

> +{
> +	struct drm_connector *connector;
> +	struct drm_connector_state *conn_state;
> +	int i;
> +
> +	for_each_connector_in_state(state, connector, conn_state, i) {
> +		if (conn_state->best_encoder != new_encoder)
> +			continue;
> +
> +		/* encoder already assigned and we're trying to re-steal it! */
> +		if (connector->state->best_encoder != conn_state->best_encoder)

Was this supposed to be new_connector->state->best_encoder?

Thierry