int xor_src_cnt;
dma_addr_t dma_dest;
- dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_FROM_DEVICE);
- for (i = 0; i < src_cnt; i++)
+ /* map the dest bidrectional in case it is re-used as a source */
+ dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_BIDIRECTIONAL);
+ for (i = 0; i < src_cnt; i++) {
+ /* only map the dest once */
+ if (unlikely(src_list[i] == dest)) {
+ dma_src[i] = dma_dest;
+ continue;
+ }
dma_src[i] = dma_map_page(dma->dev, src_list[i], offset,
len, DMA_TO_DEVICE);
+ }
while (src_cnt) {
async_flags = flags;
if (unlikely(!tx)) {
async_tx_quiesce(&depend_tx);
- while (!tx)
+ while (!tx) {
dma_async_issue_pending(chan);
tx = device->device_prep_dma_zero_sum(chan,
dma_src, src_cnt, len, result,
dma_prep_flags);
+ }
}
async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);