From: Jason Yan <yanaijie@huawei.com>
Date: Fri, 8 Dec 2017 17:42:08 +0800
Subject: [PATCH] scsi: libsas: use flush_workqueue to process disco events
synchronously
References: bsc#1085000
Git-commit: 517e5153d242cb2dd0a1150d2a7bd6788d501ca9
Patch-mainline: v4.16-rc1
Now we are processing sas event and discover event in different
workqueues. It's safe to wait the discover event done in the sas event
work. Use flush_workqueue() to insure the disco and revalidate events
processed synchronously so that the whole discover and revalidate
process will not be interrupted by other events.
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>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/libsas/sas_port.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index 93266283f51f..64722f42b256 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -192,6 +192,7 @@ static void sas_form_port(struct asd_sas_phy *phy)
si->dft->lldd_port_formed(phy);
sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
+ flush_workqueue(sas_ha->disco_q);
}
/**
@@ -277,6 +278,9 @@ void sas_porte_broadcast_rcvd(struct work_struct *work)
SAS_DPRINTK("broadcast received: %d\n", prim);
sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
+
+ if (phy->port)
+ flush_workqueue(phy->port->ha->disco_q);
}
void sas_porte_link_reset_err(struct work_struct *work)
--
2.12.3