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-rw-r--r--block/blk-tag.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/block/blk-tag.c b/block/blk-tag.c
index cc345e1..3f33d86 100644
--- a/block/blk-tag.c
+++ b/block/blk-tag.c
@@ -348,9 +348,16 @@ int blk_queue_start_tag(struct request_queue *q, struct request *rq)
*/
max_depth = bqt->max_depth;
if (!rq_is_sync(rq) && max_depth > 1) {
- max_depth -= 2;
- if (!max_depth)
+ switch (max_depth) {
+ case 2:
max_depth = 1;
+ break;
+ case 3:
+ max_depth = 2;
+ break;
+ default:
+ max_depth -= 2;
+ }
if (q->in_flight[BLK_RW_ASYNC] > max_depth)
return 1;
}