Re: [PATCH v3 15/21] nvme-fc: Do not cancel requests in io taget before it is initialized

[James Smart <jsmart833426@gmail.com>]

On 2/13/2026 8:25 PM, Mohamed Khalfella wrote:
> A new nvme-fc controller in CONNECTING state sees admin request timeout
> schedules ctrl->ioerr_work to abort inflight requests. This ends up
> calling __nvme_fc_abort_outstanding_ios() which aborts requests in both
> admin and io tagsets. In case fc_ctrl->tag_set was not initialized we
> see the warning below. This is because ctrl.queue_count is initialized
> early in nvme_fc_alloc_ctrl().
> 
> nvme nvme0: NVME-FC{0}: starting error recovery Connectivity Loss
> INFO: trying to register non-static key.
> The code is fine but needs lockdep annotation, or maybe
> lpfc 0000:ab:00.0: queue 0 connect admin queue failed (-6).
> you didn't initialize this object before use?
> turning off the locking correctness validator.
> Workqueue: nvme-reset-wq nvme_fc_ctrl_ioerr_work [nvme_fc]
> Call Trace:
>   <TASK>
>   dump_stack_lvl+0x57/0x80
>   register_lock_class+0x567/0x580
>   __lock_acquire+0x330/0xb90
>   lock_acquire.part.0+0xad/0x210
>   blk_mq_tagset_busy_iter+0xf9/0xc00
>   __nvme_fc_abort_outstanding_ios+0x23f/0x320 [nvme_fc]
>   nvme_fc_ctrl_ioerr_work+0x172/0x210 [nvme_fc]
>   process_one_work+0x82c/0x1450
>   worker_thread+0x5ee/0xfd0
>   kthread+0x3a0/0x750
>   ret_from_fork+0x439/0x670
>   ret_from_fork_asm+0x1a/0x30
>   </TASK>
> 
> Update the check in __nvme_fc_abort_outstanding_ios() confirm that io
> tagset was created before iterating over busy requests. Also make sure
> to cancel ctrl->ioerr_work before removing io tagset.
> 
> Signed-off-by: Mohamed Khalfella <mkhalfella@purestorage.com>
> ---
>   drivers/nvme/host/fc.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> index e605dd3f4a40..eac3a7ccaa5c 100644
> --- a/drivers/nvme/host/fc.c
> +++ b/drivers/nvme/host/fc.c
> @@ -2557,7 +2557,7 @@ __nvme_fc_abort_outstanding_ios(struct nvme_fc_ctrl *ctrl, bool start_queues)
>   	 * io requests back to the block layer as part of normal completions
>   	 * (but with error status).
>   	 */
> -	if (ctrl->ctrl.queue_count > 1) {
> +	if (ctrl->ctrl.queue_count > 1 && ctrl->ctrl.tagset) {
>   		nvme_quiesce_io_queues(&ctrl->ctrl);
>   		nvme_sync_io_queues(&ctrl->ctrl);
>   		blk_mq_tagset_busy_iter(&ctrl->tag_set,
> @@ -2954,6 +2954,11 @@ nvme_fc_create_io_queues(struct nvme_fc_ctrl *ctrl)
>   out_delete_hw_queues:
>   	nvme_fc_delete_hw_io_queues(ctrl);
>   out_cleanup_tagset:
> +	/*
> +	 * In CONNECTING state ctrl->ioerr_work will abort both admin
> +	 * and io tagsets. Cancel it first before removing io tagset.
> +	 */
> +	cancel_work_sync(&ctrl->ioerr_work);
>   	nvme_remove_io_tag_set(&ctrl->ctrl);
>   	nvme_fc_free_io_queues(ctrl);
>   

looks good

Signed-off-by: James Smart <jsmart833426@gmail.com>

-- james