bvprv = bvec;
} /* segments in rq */
- if (q->dma_drain_size) {
+ if (q->dma_drain_size && q->dma_drain_needed(rq)) {
+ if (rq->cmd_flags & REQ_RW)
+ memset(q->dma_drain_buffer, 0, q->dma_drain_size);
+
sg->page_link &= ~0x02;
sg = sg_next(sg);
sg_set_page(sg, virt_to_page(q->dma_drain_buffer),
((unsigned long)q->dma_drain_buffer) &
(PAGE_SIZE - 1));
nsegs++;
- rq->data_len += q->dma_drain_size;
+ rq->extra_len += q->dma_drain_size;
}
if (sg)