diff options
| -rw-r--r-- | block/blk-merge.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 8f96d683b577..895795cdb145 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -353,7 +353,7 @@ EXPORT_SYMBOL(blk_queue_split); static unsigned int __blk_recalc_rq_segments(struct request_queue *q, struct bio *bio) { - struct bio_vec bv, bvprv = { NULL }; + struct bio_vec uninitialized_var(bv), bvprv = { NULL }; unsigned int seg_size, nr_phys_segs; unsigned front_seg_size; struct bio *fbio, *bbio; @@ -400,8 +400,10 @@ new_segment: new_bio = false; } bbio = bio; - bvprv = bv; - new_bio = true; + if (likely(bio->bi_iter.bi_size)) { + bvprv = bv; + new_bio = true; + } } fbio->bi_seg_front_size = front_seg_size; @@ -527,7 +529,7 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio, struct scatterlist *sglist, struct scatterlist **sg) { - struct bio_vec bvec, bvprv = { NULL }; + struct bio_vec uninitialized_var(bvec), bvprv = { NULL }; struct bvec_iter iter; int nsegs = 0; bool new_bio = false; @@ -550,8 +552,10 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio, next_bvec: new_bio = false; } - bvprv = bvec; - new_bio = true; + if (likely(bio->bi_iter.bi_size)) { + bvprv = bvec; + new_bio = true; + } } return nsegs; |