[PATCH 1/2] nvme-core: add ctrl state transition debug helper

[Keith Busch]

On Sun, Feb 11, 2024 at 08:26:40PM -0800, Chaitanya Kulkarni wrote:
> @@ -621,6 +636,9 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
>  	}
>  
>  	if (changed) {
> +		dev_dbg(ctrl->device, "%s %s -> %s\n", __func__,
> +			nvme_ctrl_state_str(old_state),
> +			nvme_ctrl_state_str(new_state));
>  		WRITE_ONCE(ctrl->state, new_state);
>  		wake_up_all(&ctrl->state_wq);
>  	}

Turing the system logs up to debug level might get you a whole lot of
unrelated stuff. Could a new trace_event get you what you need instead?
There's more fine grain control on those.