From 44c6ec77e12c387aaba420b30a54b94966f0d9e8 Mon Sep 17 00:00:00 2001 From: James Smart Date: Wed, 25 Oct 2017 16:43:14 -0700 Subject: nvme-fc: change ctlr state assignments during reset/reconnect Clean up some of the controller state checks and add the RESETTING->RECONNECTING state transition. Specifically: - the movement of the RESETTING state change and schedule of reset_work to core doesn't work wiht nvme_fc_error_recovery setting state to RECONNECTING before attempting to reset. Remove the state change as the reset request does it. - In the rare cases where an error occurs right as we're transitioning to LIVE, defer the controller start actions. - In error handling on teardown of associations while performing initial controller creation - avoid quiesce calls on the admin_q. They are unneeded. - Add the RESETTING->RECONNECTING transition in the reset handler. Signed-off-by: James Smart Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Reviewed-by: Hannes Reinecke Signed-off-by: Christoph Hellwig --- drivers/nvme/host/fc.c | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 6a025a8d8c32..e37c69f7921d 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -1884,13 +1884,6 @@ nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg) dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: resetting controller\n", ctrl->cnum); - if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) { - dev_err(ctrl->ctrl.device, - "NVME-FC{%d}: error_recovery: Couldn't change state " - "to RECONNECTING\n", ctrl->cnum); - return; - } - nvme_reset_ctrl(&ctrl->ctrl); } @@ -2528,11 +2521,11 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) } changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); - WARN_ON_ONCE(!changed); ctrl->ctrl.nr_reconnects = 0; - nvme_start_ctrl(&ctrl->ctrl); + if (changed) + nvme_start_ctrl(&ctrl->ctrl); return 0; /* Success */ @@ -2600,7 +2593,8 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl) * use blk_mq_tagset_busy_itr() and the transport routine to * terminate the exchanges. */ - blk_mq_quiesce_queue(ctrl->ctrl.admin_q); + if (ctrl->ctrl.state != NVME_CTRL_NEW) + blk_mq_quiesce_queue(ctrl->ctrl.admin_q); blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, nvme_fc_terminate_exchange, &ctrl->ctrl); @@ -2649,12 +2643,8 @@ nvme_fc_delete_ctrl(struct nvme_ctrl *nctrl) static void nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status) { - /* If we are resetting/deleting then do nothing */ - if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) { - WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW || - ctrl->ctrl.state == NVME_CTRL_LIVE); + if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) return; - } dev_info(ctrl->ctrl.device, "NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n", @@ -2683,9 +2673,17 @@ nvme_fc_reset_ctrl_work(struct work_struct *work) int ret; nvme_stop_ctrl(&ctrl->ctrl); + /* will block will waiting for io to terminate */ nvme_fc_delete_association(ctrl); + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) { + dev_err(ctrl->ctrl.device, + "NVME-FC{%d}: error_recovery: Couldn't change state " + "to RECONNECTING\n", ctrl->cnum); + return; + } + ret = nvme_fc_create_association(ctrl); if (ret) nvme_fc_reconnect_or_delete(ctrl, ret); -- cgit v1.2.3