Re: [PATCH v5 7/7] scsi: libsas: notify event PORTE_BROADCAST_RCVD in sas_enable_revalidation()

[Hannes Reinecke <hare@suse.de>]

On 12/08/2017 10:42 AM, Jason Yan wrote:
> There are two places queuing the disco event DISCE_REVALIDATE_DOMAIN.
> One is in sas_porte_broadcast_rcvd() and uses sas_chain_event() to queue
> the event. The other is in sas_enable_revalidation() and uses
> sas_queue_event() to queue the event. We have diffrent work queues for
> event and discovery now, so the DISCE_REVALIDATE_DOMAIN event may be
> processed in both event queue and discovery queue.
> 
> Now since we do synchronous event handling, we cannot do it in discovery
> queue, so have to trigger a fake broadcast event to re-trigger the
> revalidation from event queue.
> 
> Signed-off-by: Jason Yan <yanaijie@huawei.com>
> CC: John Garry <john.garry@huawei.com>
> CC: Johannes Thumshirn <jthumshirn@suse.de>
> CC: Ewan Milne <emilne@redhat.com>
> CC: Christoph Hellwig <hch@lst.de>
> CC: Tomas Henzl <thenzl@redhat.com>
> CC: Dan Williams <dan.j.williams@intel.com>
> ---
>  drivers/scsi/libsas/sas_event.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c
> index 8c82c00..ae923eb 100644
> --- a/drivers/scsi/libsas/sas_event.c
> +++ b/drivers/scsi/libsas/sas_event.c
> @@ -116,11 +116,17 @@ void sas_enable_revalidation(struct sas_ha_struct *ha)
>  		struct asd_sas_port *port = ha->sas_port[i];
>  		const int ev = DISCE_REVALIDATE_DOMAIN;
>  		struct sas_discovery *d = &port->disc;
> +		struct asd_sas_phy *sas_phy;
>  
>  		if (!test_and_clear_bit(ev, &d->pending))
>  			continue;
>  
> -		sas_queue_event(ev, &d->disc_work[ev].work, ha);
> +		if (list_empty(&port->phy_list))
> +			continue;
> +
> +		sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
> +				port_phy_el);
> +		ha->notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
>  	}
>  	mutex_unlock(&ha->disco_mutex);
>  }
> 
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)