block: Consolidate phys_segment and hw_segment limits

Except for SCSI no device drivers distinguish between physical and
hardware segment limits.  Consolidate the two into a single segment
limit.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 99cb5cf1f447..5e7dc9973458 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -206,8 +206,7 @@ static inline int ll_new_hw_segment(struct request_queue *q,
 {
         int nr_phys_segs = bio_phys_segments(q, bio);
 
-        if (req->nr_phys_segments + nr_phys_segs > queue_max_hw_segments(q) ||
-            req->nr_phys_segments + nr_phys_segs > queue_max_phys_segments(q)) {
+        if (req->nr_phys_segments + nr_phys_segs > queue_max_segments(q)) {
                 req->cmd_flags |= REQ_NOMERGE;
                 if (req == q->last_merge)
                         q->last_merge = NULL;
@@ -300,10 +299,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
                 total_phys_segments--;
         }
 
-        if (total_phys_segments > queue_max_phys_segments(q))
-                return 0;
-
-        if (total_phys_segments > queue_max_hw_segments(q))
+        if (total_phys_segments > queue_max_segments(q))
                 return 0;
 
         /* Merge is OK... */