From: James Smart <jsmart2021@gmail.com>
Date: Thu, 15 Jun 2017 22:56:48 -0700
Subject: scsi: lpfc: Fix crash doing IO with resets
Patch-mainline: v4.13-rc1
Git-commit: 11e644e2a2afa34a4d0ca896cf722572317b21ed
References: bsc#1050239,FATE#322918

During every reset, IOCBs are allocated. So, at one point, number of
allocated IOCBs reaches maximum limit and lpfc_sli_next_iotag fails.

Allocate IOCBs only during initialization. Reuse them after every reset
instead of allocating new set of IOCBs.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/scsi/lpfc/lpfc_sli.c |   22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -6927,18 +6927,6 @@ lpfc_sli4_hba_setup(struct lpfc_hba *phb
 		cnt = phba->cfg_iocb_cnt * 1024;
 		/* We need 1 iocbq for every SGL, for IO processing */
 		cnt += phba->sli4_hba.nvmet_xri_cnt;
-		/* Initialize and populate the iocb list per host */
-		lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
-				"2821 initialize iocb list %d total %d\n",
-				phba->cfg_iocb_cnt, cnt);
-		rc = lpfc_init_iocb_list(phba, cnt);
-		if (rc) {
-			lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-					"1413 Failed to init iocb list.\n");
-			goto out_destroy_queue;
-		}
-
-		lpfc_nvmet_create_targetport(phba);
 	} else {
 		/* update host scsi xri-sgl sizes and mappings */
 		rc = lpfc_sli4_scsi_sgl_update(phba);
@@ -6959,18 +6947,24 @@ lpfc_sli4_hba_setup(struct lpfc_hba *phb
 		}
 
 		cnt = phba->cfg_iocb_cnt * 1024;
+	}
+
+	if (!phba->sli.iocbq_lookup) {
 		/* Initialize and populate the iocb list per host */
 		lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
-				"2820 initialize iocb list %d total %d\n",
+				"2821 initialize iocb list %d total %d\n",
 				phba->cfg_iocb_cnt, cnt);
 		rc = lpfc_init_iocb_list(phba, cnt);
 		if (rc) {
 			lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-					"6301 Failed to init iocb list.\n");
+					"1413 Failed to init iocb list.\n");
 			goto out_destroy_queue;
 		}
 	}
 
+	if (phba->nvmet_support)
+		lpfc_nvmet_create_targetport(phba);
+
 	if (phba->nvmet_support && phba->cfg_nvmet_mrq) {
 		/* Post initial buffers to all RQs created */
 		for (i = 0; i < phba->cfg_nvmet_mrq; i++) {