drm/i915: adjust has_pending_fb_unpin to atomic

bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv)

{

	struct intel_crtc *crtc;

	/* Note that we don't need to be called with mode_config.lock here

	 * as our list of CRTC objects is static for the lifetime of the

	 * device and so cannot disappear as we iterate. Similarly, we can

	 * happily treat the predicates as racy, atomic checks as userspace

	 * cannot claim and pin a new fb without at least acquring the

	 * struct_mutex and so serialising with us.

	 */

	for_each_intel_crtc(&dev_priv->drm, crtc) {

		if (atomic_read(&crtc->unpin_work_count) == 0)

	struct drm_crtc *crtc;

	bool cleanup_done;

	drm_for_each_crtc(crtc, &dev_priv->drm) {

		struct drm_crtc_commit *commit;

		spin_lock(&crtc->commit_lock);

		commit = list_first_entry_or_null(&crtc->commit_list,

						  struct drm_crtc_commit, commit_entry);

		cleanup_done = commit ?

			try_wait_for_completion(&commit->cleanup_done) : true;

		spin_unlock(&crtc->commit_lock);

		if (cleanup_done)

			continue;

		if (crtc->flip_work)

			intel_wait_for_vblank(dev_priv, crtc->pipe);

		drm_crtc_wait_one_vblank(crtc);

		return true;

	}