Merge branch 'pm-cpufreq'

[karo-tx-linux.git] / block / blk-merge.c

diff --git a/block/blk-merge.c b/block/blk-merge.c
index b3bf0df0f4c2743aa99ef7ac179db324eb5e4657..54535831f1e197a6a6c56a5cc8a4b08e90d4020b 100644 (file)
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -568,6 +568,8 @@ int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
 
 bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
 {
+       struct request_queue *q = rq->q;
+
        if (!rq_mergeable(rq) || !bio_mergeable(bio))
                return false;
 
@@ -591,6 +593,14 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
            !blk_write_same_mergeable(rq->bio, bio))
                return false;
 
+       if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS)) {
+               struct bio_vec *bprev;
+
+               bprev = &rq->biotail->bi_io_vec[bio->bi_vcnt - 1];
+               if (bvec_gap_to_prev(bprev, bio->bi_io_vec[0].bv_offset))
+                       return false;
+       }
+
        return true;
 }