crypto/async_tx/async_tx.c

46 	struct dma_async_tx_descriptor *depend_tx = submit->depend_tx;
49 	if (depend_tx &&
50 	    dma_has_cap(tx_type, depend_tx->chan->device->cap_mask))
51 		return depend_tx->chan;
61  * @depend_tx: the operation that must finish before the new operation runs
65 async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx,
68 	struct dma_chan *chan = depend_tx->chan;
72 	/* first check to see if we can still append to depend_tx */
73 	txd_lock(depend_tx);
74 	if (txd_parent(depend_tx) && depend_tx->chan == tx->chan) {
75 		txd_chain(depend_tx, tx);
78 	txd_unlock(depend_tx);
103 		txd_lock(depend_tx);
104 		if (txd_parent(depend_tx)) {
105 			txd_chain(depend_tx, intr_tx);
109 		txd_unlock(depend_tx);
118 		if (dma_wait_for_async_tx(depend_tx) != DMA_COMPLETE)
119 			panic("%s: DMA error waiting for depend_tx\n",
132  * while holding depend_tx->lock we must avoid submitting new operations
146 	struct dma_async_tx_descriptor *depend_tx = submit->depend_tx;
151 	if (depend_tx) {
160 		BUG_ON(async_tx_test_ack(depend_tx) || txd_next(depend_tx) ||
166 		txd_lock(depend_tx);
167 		if (txd_parent(depend_tx)) {
172 			if (depend_tx->chan == chan) {
173 				txd_chain(depend_tx, tx);
181 			if (depend_tx->chan == chan)
186 		txd_unlock(depend_tx);
192 			async_tx_channel_switch(depend_tx, tx);
207 	if (depend_tx)
208 		async_tx_ack(depend_tx);
226 	struct dma_async_tx_descriptor *depend_tx = submit->depend_tx;
228 	if (depend_tx) {
229 		chan = depend_tx->chan;
250 		async_tx_quiesce(&submit->depend_tx);