scsi: hisi_sas: Check sas_port before using it

Need to check the structure sas_port before using it.

Link: https://lore.kernel.org/r/1573551059-107873-2-git-send-email-john.garry@huawei.com
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 18c95b33592b0fcd2d4ebb5e0477d85c8f5a8c95..c72fc59353bd3ee11877ab255cc917597c10114e 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -974,12 +974,13 @@ static void hisi_sas_port_notify_formed(struct asd_sas_phy *sas_phy)
        struct hisi_hba *hisi_hba = sas_ha->lldd_ha;
        struct hisi_sas_phy *phy = sas_phy->lldd_phy;
        struct asd_sas_port *sas_port = sas_phy->port;
-       struct hisi_sas_port *port = to_hisi_sas_port(sas_port);
+       struct hisi_sas_port *port;
        unsigned long flags;
 
        if (!sas_port)
                return;
 
+       port = to_hisi_sas_port(sas_port);
        spin_lock_irqsave(&hisi_hba->lock, flags);
        port->port_attached = 1;
        port->id = phy->port_id;