NVMe: Command abort handling fixes

Aborts all requeued commands prior to killing the request_queue. For
commands that time out on a dying request queue, set the "Do Not Retry"
bit on the command status so the command cannot be requeued. Finanally, if
the driver is requested to abort a command it did not start, do nothing.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 5fcb993..ad9a9b6 100644 (file)
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1064,15 +1064,22 @@ static void nvme_cancel_queue_ios(struct blk_mq_hw_ctx *hctx,
        void *ctx;
        nvme_completion_fn fn;
        struct nvme_cmd_info *cmd;
-       static struct nvme_completion cqe = {
-               .status = cpu_to_le16(NVME_SC_ABORT_REQ << 1),
-       };
+       struct nvme_completion cqe;
+
+       if (!blk_mq_request_started(req))
+               return;
 
        cmd = blk_mq_rq_to_pdu(req);
 
        if (cmd->ctx == CMD_CTX_CANCELLED)
                return;
 
+       if (blk_queue_dying(req->q))
+               cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1);
+       else
+               cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1);
+
+
        dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n",
                                                req->tag, nvmeq->qid);
        ctx = cancel_cmd_info(cmd, &fn);
@@ -2429,8 +2436,10 @@ static void nvme_dev_remove(struct nvme_dev *dev)
        list_for_each_entry(ns, &dev->namespaces, list) {
                if (ns->disk->flags & GENHD_FL_UP)
                        del_gendisk(ns->disk);
-               if (!blk_queue_dying(ns->queue))
+               if (!blk_queue_dying(ns->queue)) {
+                       blk_mq_abort_requeue_list(ns->queue);
                        blk_cleanup_queue(ns->queue);
+               }
        }
 }