From: James Smart <jsmart2021@gmail.com>
Date: Tue, 26 Jun 2018 08:24:23 -0700
Subject: [PATCH] scsi: lpfc: Fix driver not setting dpp bits correctly in
 doorbell word
References: bsc#1102658
Git-commit: 5cc167ddb7441013e2b5a5f47bf11af0264bb3e8
Patch-mainline: v4.19-rc1

Driver is incorrectly formatting a register on new hardware, using a format
for an older chip. This can result in non-deterministic behavior.

Ensure driver is not setting "workqueue index" in the WQ doorbell when
making a non-dpp doorbell write. The field must be zero when non-dpp.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/lpfc/lpfc_sli.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index d4510e64856a..a25e38ac64e3 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -145,6 +145,7 @@ lpfc_sli4_wq_put(struct lpfc_queue *q, union lpfc_wqe128 *wqe)
 	uint32_t idx;
 	uint32_t i = 0;
 	uint8_t *tmp;
+	u32 if_type;
 
 	/* sanity check on queue memory */
 	if (unlikely(!q))
@@ -199,8 +200,14 @@ lpfc_sli4_wq_put(struct lpfc_queue *q, union lpfc_wqe128 *wqe)
 			    q->queue_id);
 		} else {
 			bf_set(lpfc_wq_db_list_fm_num_posted, &doorbell, 1);
-			bf_set(lpfc_wq_db_list_fm_index, &doorbell, host_index);
 			bf_set(lpfc_wq_db_list_fm_id, &doorbell, q->queue_id);
+
+			/* Leave bits <23:16> clear for if_type 6 dpp */
+			if_type = bf_get(lpfc_sli_intf_if_type,
+					 &q->phba->sli4_hba.sli_intf);
+			if (if_type != LPFC_SLI_INTF_IF_TYPE_6)
+				bf_set(lpfc_wq_db_list_fm_index, &doorbell,
+				       host_index);
 		}
 	} else if (q->db_format == LPFC_DB_RING_FORMAT) {
 		bf_set(lpfc_wq_db_ring_fm_num_posted, &doorbell, 1);
-- 
2.12.3