[PATCH 5/7] block: clear drain buffer if draining for write command

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

Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
 block/blk-merge.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index d50cfc8..d0b9031 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -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),
-- 
1.5.2.4

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