Commit db0a2e00 authored Feb 19, 2008 by Tejun Heo Committed by Jens Axboe Feb 19, 2008

block: clear drain buffer if draining for write command



Clear drain buffer before chaining if the command in question is a
write.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

parent 2fb98e84

block/blk-merge.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -221,6 +221,9 @@ new_segment:
		} /* segments in rq */

		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),