Re: [PATCH v3 09/11] scsi: scsi_debug: Use scsi_host_busy() in delay_store() and ndelay_store()

[Douglas Gilbert]

On 2023-03-27 03:43, John Garry wrote:
> The functions to update ndelay and delay value first check whether we have
> any in-flight IO for any host. It does this by checking if any tag is used
> in the global submit queues.
>
> We can achieve the same by setting the host as blocked and then ensuring
> that we have no in-flight commands with scsi_host_busy().
>
> Note that scsi_host_busy() checks SCMD_STATE_INFLIGHT flag, which is only
> set per command after we ensure that the host is not blocked, i.e. we
> see more commands active after the check for scsi_host_busy() returns 0.
>
> Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>

Thanks.