[PATCH Xenial SRU] lpfc: Fix DMA faults observed upon plugging loopback connector

[Tim Gardner]

From: James Smart <james.smart at broadcom.com>

BugLink: http://bugs.launchpad.net/bugs/1587316

Driver didn't program the REG_VFI mailbox correctly, giving the adapter
bad addresses.

Signed-off-by: Dick Kennedy <dick.kennedy at avagotech.com>
Signed-off-by: James Smart <james.smart at avagotech.com>
Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
(cherry picked from commit ae09c765109293b600ba9169aa3d632e1ac1a843)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 drivers/scsi/lpfc/lpfc_mbox.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_mbox.c b/drivers/scsi/lpfc/lpfc_mbox.c
index f87f90e..1e34b54 100644
--- a/drivers/scsi/lpfc/lpfc_mbox.c
+++ b/drivers/scsi/lpfc/lpfc_mbox.c
@@ -2145,10 +2145,12 @@ lpfc_reg_vfi(struct lpfcMboxq *mbox, struct lpfc_vport *vport, dma_addr_t phys)
 	reg_vfi->wwn[1] = cpu_to_le32(reg_vfi->wwn[1]);
 	reg_vfi->e_d_tov = phba->fc_edtov;
 	reg_vfi->r_a_tov = phba->fc_ratov;
-	reg_vfi->bde.addrHigh = putPaddrHigh(phys);
-	reg_vfi->bde.addrLow = putPaddrLow(phys);
-	reg_vfi->bde.tus.f.bdeSize = sizeof(vport->fc_sparam);
-	reg_vfi->bde.tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+	if (phys) {
+		reg_vfi->bde.addrHigh = putPaddrHigh(phys);
+		reg_vfi->bde.addrLow = putPaddrLow(phys);
+		reg_vfi->bde.tus.f.bdeSize = sizeof(vport->fc_sparam);
+		reg_vfi->bde.tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+	}
 	bf_set(lpfc_reg_vfi_nport_id, reg_vfi, vport->fc_myDID);
 
 	/* Only FC supports upd bit */
-- 
1.9.1