block: kill swap_io_context()

It blindly copies everything in the io_context, including the lock.
That doesn't work so well for either lock ordering or lockdep.

There seems zero point in swapping io contexts on a request to request
merge, so the best point of action is to just remove it.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 0 insertions, 14 deletions

diff --git a/block/as-iosched.c b/block/as-iosched.c
index 612d64096300..8c3946787dbb 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1268,22 +1268,8 @@ static void as_merged_requests(struct request_queue *q, struct request *req,
          */
         if (!list_empty(&req->queuelist) && !list_empty(&next->queuelist)) {
                 if (time_before(rq_fifo_time(next), rq_fifo_time(req))) {
-                        struct io_context *rioc = RQ_IOC(req);
-                        struct io_context *nioc = RQ_IOC(next);
-
                         list_move(&req->queuelist, &next->queuelist);
                         rq_set_fifo_time(req, rq_fifo_time(next));
-                        /*
-                         * Don't copy here but swap, because when anext is
-                         * removed below, it must contain the unused context
-                         */
-                        if (rioc != nioc) {
-                                double_spin_lock(&rioc->lock, &nioc->lock,
-                                                                rioc < nioc);
-                                swap_io_context(&rioc, &nioc);
-                                double_spin_unlock(&rioc->lock, &nioc->lock,
-                                                                rioc < nioc);
-                        }
                 }
         }