nvme: move the fabrics queue ready check routines to core

queue_rq() in pci only checks if the dispatched queue (nvmeq) is ready,
e.g. not being suspended. Since nvme_alloc_admin_tags() in reset flow
restarts the admin queue, users are able to submit admin commands to a
controller before reset_work() completes. Commands submitted under this
condition may interfere with commands that performs identify, IO queue
setup in reset_work(), and may result in a hang described in the
following patch.

As seen in the fabrics, user commands are prevented from being executed
under inproper controller states. We may reuse this logic to maintain a
clear admin queue during reset_work().

Signed-off-by: Tao Chiu <taochiu@synology.com>
Signed-off-by: Cody Wong <codywong@synology.com>
Reviewed-by: Leon Chien <leonchien@synology.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 0 insertions, 57 deletions

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 13c2747e3d00..a2bb7fc63a73 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -533,63 +533,6 @@ static struct nvmf_transport_ops *nvmf_lookup_transport(
 	return NULL;
 }
 
-/*
- * For something we're not in a state to send to the device the default action
- * is to busy it and retry it after the controller state is recovered.  However,
- * if the controller is deleting or if anything is marked for failfast or
- * nvme multipath it is immediately failed.
- *
- * Note: commands used to initialize the controller will be marked for failfast.
- * Note: nvme cli/ioctl commands are marked for failfast.
- */
-blk_status_t nvmf_fail_nonready_command(struct nvme_ctrl *ctrl,
-		struct request *rq)
-{
-	if (ctrl->state != NVME_CTRL_DELETING_NOIO &&
-	    ctrl->state != NVME_CTRL_DEAD &&
-	    !test_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags) &&
-	    !blk_noretry_request(rq) && !(rq->cmd_flags & REQ_NVME_MPATH))
-		return BLK_STS_RESOURCE;
-	return nvme_host_path_error(rq);
-}
-EXPORT_SYMBOL_GPL(nvmf_fail_nonready_command);
-
-bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
-		bool queue_live)
-{
-	struct nvme_request *req = nvme_req(rq);
-
-	/*
-	 * currently we have a problem sending passthru commands
-	 * on the admin_q if the controller is not LIVE because we can't
-	 * make sure that they are going out after the admin connect,
-	 * controller enable and/or other commands in the initialization
-	 * sequence. until the controller will be LIVE, fail with
-	 * BLK_STS_RESOURCE so that they will be rescheduled.
-	 */
-	if (rq->q == ctrl->admin_q && (req->flags & NVME_REQ_USERCMD))
-		return false;
-
-	/*
-	 * Only allow commands on a live queue, except for the connect command,
-	 * which is require to set the queue live in the appropinquate states.
-	 */
-	switch (ctrl->state) {
-	case NVME_CTRL_CONNECTING:
-		if (blk_rq_is_passthrough(rq) && nvme_is_fabrics(req->cmd) &&
-		    req->cmd->fabrics.fctype == nvme_fabrics_type_connect)
-			return true;
-		break;
-	default:
-		break;
-	case NVME_CTRL_DEAD:
-		return false;
-	}
-
-	return queue_live;
-}
-EXPORT_SYMBOL_GPL(__nvmf_check_ready);
-
 static const match_table_t opt_tokens = {
 	{ NVMF_OPT_TRANSPORT,		"transport=%s"		},
 	{ NVMF_OPT_TRADDR,		"traddr=%s"		},