4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

commit 4086d90cffb8f48400d51fbab575fe50458512e3 upstream.

All atomic state should be cleared when drm_modeset_backoff() is
called, because it drops all locks and the state becomes invalid.

The call to drm_atomic_state_clear was missing in atomic_remove_fb,
so add the missing call there.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629115954.26029-1-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <redacted>
Fixes: db8f6403e88a ("drm: Convert drm_framebuffer_remove to atomic, v4.")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_framebuffer.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c

@@ -832,6 +832,7 @@ unlock:
 		drm_atomic_clean_old_fb(dev, plane_mask, ret);
 
 	if (ret == -EDEADLK) {
+		drm_atomic_state_clear(state);
 		drm_modeset_backoff(&ctx);
 		goto retry;
 	}