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authorChristoph Hellwig <hch@lst.de>2016-07-19 11:31:50 +0200
committerJens Axboe <axboe@fb.com>2016-07-21 01:38:30 +0200
commit0c4de0f33b0a86a426c0c3958cd40d8c82ede8d2 (patch)
treed3666484b5a0f67400eacef1225826799390aa73 /block/blk-mq.c
parentvirtio_blk: use blk_rq_map_kern (diff)
downloadlinux-0c4de0f33b0a86a426c0c3958cd40d8c82ede8d2.tar.xz
linux-0c4de0f33b0a86a426c0c3958cd40d8c82ede8d2.zip
block: ensure bios return from blk_get_request are properly initialized
blk_get_request is used for BLOCK_PC and similar passthrough requests. Currently we always need to call blk_rq_set_block_pc or an open coded version of it to allow appending bios using the request mapping helpers later on, which is a somewhat awkward API. Instead move the initialization part of blk_rq_set_block_pc into blk_get_request, so that we always have a safe to use request. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7aa60c4f56fd..8f4fac87a395 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -263,6 +263,10 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
blk_queue_exit(q);
return ERR_PTR(-EWOULDBLOCK);
}
+
+ rq->__data_len = 0;
+ rq->__sector = (sector_t) -1;
+ rq->bio = rq->biotail = NULL;
return rq;
}
EXPORT_SYMBOL(blk_mq_alloc_request);