block: remove request ref_count

This reference count has been around since before git history, but the only
place where it's used is in blk_execute_rq, and ther it is entirely useless
as it is incremented before submitting the request and decremented in the
end_io handler before waking up the submitter thread.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 0 insertions, 10 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 213e9f01c627..18faa7e81d3b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -145,7 +145,6 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
         rq->cmd = rq->__cmd;
         rq->cmd_len = BLK_MAX_CDB;
         rq->tag = -1;
-        rq->ref_count = 1;
         rq->start_time = jiffies;
         set_start_time_ns(rq);
         rq->part = NULL;
@@ -1272,8 +1271,6 @@ void __blk_put_request(struct request_queue *q, struct request *req)
 {
         if (unlikely(!q))
                 return;
-        if (unlikely(--req->ref_count))
-                return;
 
         blk_pm_put_request(req);
 
diff --git a/block/blk-exec.c b/block/blk-exec.c
index ae4f27d7944e..6b18d82d91c5 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -24,7 +24,6 @@ static void blk_end_sync_rq(struct request *rq, int error)
         struct completion *waiting = rq->end_io_data;
 
         rq->end_io_data = NULL;
-        __blk_put_request(rq->q, rq);
 
         /*
          * complete last, if this is a stack request the process (and thus
@@ -103,12 +102,6 @@ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
         int err = 0;
         unsigned long hang_check;
 
-        /*
-         * we need an extra reference to the request, so we can look at
-         * it after io completion
-         */
-        rq->ref_count++;
-
         if (!rq->sense) {
                 memset(sense, 0, sizeof(sense));
                 rq->sense = sense;