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authorTejun Heo <htejun@gmail.com>2008-02-19 11:36:55 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-02-19 11:36:55 +0100
commitdb0a2e0099be3a1cff55879225881465f16c67d3 (patch)
tree297f788296f1722b4a6b2e5947fa9a3aa63dc36b /block
parent2fb98e8414c42cb14698833aac640b143b9ade4f (diff)
downloadblackbird-op-linux-db0a2e0099be3a1cff55879225881465f16c67d3.tar.gz
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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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-merge.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index bef1b4d0fc02..7506c4fe0264 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),
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