drm/vmwgfx: Fix single framebuffer detection.

V2: Fix a typo.

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
index 9089159..a348fec 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
@@ -130,6 +130,7 @@ static int vmw_ldu_del_active(struct vmw_private *vmw_priv,
        if (list_empty(&ldu->active))
                return 0;
 
+       /* Must init otherwise list_empty(&ldu->active) will not work. */
        list_del_init(&ldu->active);
        if (--(ld->num_active) == 0) {
                BUG_ON(!ld->fb);
@@ -208,6 +209,8 @@ static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
 
        /* ldu only supports one fb active at the time */
        if (dev_priv->ldu_priv->fb && vfb &&
+           !(dev_priv->ldu_priv->num_active == 1 &&
+             !list_empty(&ldu->active)) &&
            dev_priv->ldu_priv->fb != vfb) {
                DRM_ERROR("Multiple framebuffers not supported\n");
                return -EINVAL;