linux-kernel - Re: [PATCH v5 7/7] scsi: libsas: notify event PORTE_BROADCAST_RCVD in sas_enable

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Date:   Fri, 15 Dec 2017 13:26:14 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Jason Yan <yanaijie@...wei.com>, martin.petersen@...cle.com,
        jejb@...ux.vnet.ibm.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.garry@...wei.com, zhaohongjiang@...wei.com, hare@...e.com,
        dan.j.williams@...el.com, jthumshirn@...e.de,
        Raj.Dinesh@...rosemi.com, hch@....de, huangdaode@...ilicon.com,
        chenxiang66@...ilicon.com, xiyou.wangcong@...il.com,
        Ewan Milne <emilne@...hat.com>, Tomas Henzl <thenzl@...hat.com>
Subject: Re: [PATCH v5 7/7] scsi: libsas: notify event PORTE_BROADCAST_RCVD in
 sas_enable_revalidation()

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@...wei.com>
> CC: John Garry <john.garry@...wei.com>
> CC: Johannes Thumshirn <jthumshirn@...e.de>
> CC: Ewan Milne <emilne@...hat.com>
> CC: Christoph Hellwig <hch@....de>
> CC: Tomas Henzl <thenzl@...hat.com>
> CC: Dan Williams <dan.j.williams@...el.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@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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