drm: Change deadlock-avoidance algorithm for the modeset locks.

For modeset locks we don't expect a high number of contending
transactions so change algorithm from Wait-Die to Wound-Wait.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
Acked-by: NIngo Molnar <mingo@kernel.org>

drivers/gpu/drm/drm_modeset_lock.c

@@ -70,7 +70,7 @@
  * lists and lookup data structures.
  */
 
-static DEFINE_WD_CLASS(crtc_ww_class);
+static DEFINE_WW_CLASS(crtc_ww_class);
 
 /**
  * drm_modeset_lock_all - take all modeset locks