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44  * dma_fence_chain_init(chain, prev, fence, seqno)
46  *	Initialize a fence chain node.  If prev was already a chain,
50 dma_fence_chain_init(struct dma_fence_chain *chain, struct dma_fence *prev,
53 	struct dma_fence_chain *prev_chain = to_dma_fence_chain(prev);
57 	chain->dfc_prev = prev;	  /* consume caller's reference */
62 	    !__dma_fence_is_later(seqno, prev->seqno, prev->ops)) {
65 			seqno = MAX(prev->seqno, seqno);
68 		context = prev->context;
69 		chain->prev_seqno = prev->seqno;
160 	struct dma_fence *prev;
168 	while ((prev = chain->dfc_prev) != NULL) {
173 		if (kref_read(&prev->refcount) > 1)
175 		if ((prev_chain = to_dma_fence_chain(prev)) == NULL)
180 		 * prev so this is safe.  This dma_fence_put triggers
186 		dma_fence_put(prev);
188 	dma_fence_put(prev);
228 	struct dma_fence *prev;
231 	prev = dma_fence_get_rcu_safe(&chain->dfc_prev);
234 	return prev;
248 	struct dma_fence *prev, *splice;
255 	while ((prev = get_prev(chain)) != NULL) {
256 		if ((prev_chain = to_dma_fence_chain(prev)) != NULL) {
261 			if (!dma_fence_is_signaled(prev))
266 		if (atomic_cas_ptr(&chain->dfc_prev, prev, splice) == prev)
267 			dma_fence_put(prev); /* transferred to splice */
270 		dma_fence_put(prev);
274 	return prev;