drm_atomic_state_clear — clear state object
void drm_atomic_state_clear ( | struct drm_atomic_state * state); |
When the w/w mutex algorithm detects a deadlock we need to back off and drop
all locks. So someone else could sneak in and change the current modeset
configuration. Which means that all the state assembled in state is no
longer an atomic update to the current state, but to some arbitrary earlier
state. Which could break assumptions the driver's ->atomic_check likely
relies on.
Hence we must clear all cached state and completely start over, using this function.