[PATCH] lpfc 8.1.3: Fix polling mode panic

Fix polling mode panic

Cause: Race between interrupt driven and polling path in harvesting iocbs
from
the response ring.
Signed-off-by: Jamie Wellnitz <Jamie.Wellnitz@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/lpfc/lpfc_scsi.c

@@ -467,6 +467,11 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 	sdev = cmd->device;
 	cmd->scsi_done(cmd);
 
+	if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
+		lpfc_release_scsi_buf(phba, lpfc_cmd);
+		return;
+	}
+
 	if (!result && pnode != NULL &&
 	   ((jiffies - pnode->last_ramp_up_time) >
 		LPFC_Q_RAMP_UP_INTERVAL * HZ) &&

drivers/scsi/lpfc/lpfc_sli.c

@@ -1154,6 +1154,10 @@ lpfc_sli_handle_fast_ring_event(struct lpfc_hba * phba,
 			cmdiocbq = lpfc_sli_iocbq_lookup(phba, pring,
 							 &rspiocbq);
 			if ((cmdiocbq) && (cmdiocbq->iocb_cmpl)) {
+				if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
+					(cmdiocbq->iocb_cmpl)(phba, cmdiocbq,
+							      &rspiocbq);
+				} else {
 					spin_unlock_irqrestore(
 						phba->host->host_lock, iflag);
 					(cmdiocbq->iocb_cmpl)(phba, cmdiocbq,
@@ -1161,6 +1165,7 @@ lpfc_sli_handle_fast_ring_event(struct lpfc_hba * phba,
 					spin_lock_irqsave(phba->host->host_lock,
 							  iflag);
 				}
+			}
 			break;
 		default:
 			if (irsp->ulpCommand == CMD_ADAPTER_MSG) {