[PATCH v4 09/11] libsas: libsas: use flush_workqueue to process disco events synchronously

[Jason Yan]

Use flush_workqueue to insure the disco and revalidate events processed 
synchronously.

Signed-off-by: Jason Yan <yanai...@huawei.com>
CC: John Garry <john.ga...@huawei.com>
CC: Johannes Thumshirn <jthumsh...@suse.de>
CC: Ewan Milne <emi...@redhat.com>
CC: Christoph Hellwig <h...@lst.de>
CC: Tomas Henzl <the...@redhat.com>
CC: Dan Williams <dan.j.willi...@intel.com>
---
 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 9326628..64722f4 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)
-- 
2.5.0