[PATCH] nvme-core: update NS Attr Changed AEN handling for ANA group

[Sagi Grimberg]

> Fix this by reading the ANA log page as part of ana_work so
> that ngrps gets updated, prior to invoking nvme_queue_scan().

Nothing guarantees ordering here..

> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index fff90200497c..749d45c207f7 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -4315,6 +4315,10 @@ static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
>   	switch (aer_notice_type) {
>   	case NVME_AER_NOTICE_NS_CHANGED:
>   		set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events);
> +#ifdef CONFIG_NVME_MULTIPATH
> +		if (ctrl->ana_log_buf)
> +			queue_work(nvme_wq, &ctrl->ana_work);
> +#endif
>   		nvme_queue_scan(ctrl);
>   		break;
>   	case NVME_AER_NOTICE_FW_ACT_STARTING:
>