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-rw-r--r--block/blk-merge.c16
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;