[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>

2 files changed, 16 insertions, 6 deletions

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 094f18f1fa05..f93799873721 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/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) &&
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index d08fd89dd44f..764aadbec71b 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1154,12 +1154,17 @@ lpfc_sli_handle_fast_ring_event(struct lpfc_hba * phba,
                         cmdiocbq = lpfc_sli_iocbq_lookup(phba, pring,
                                                          &rspiocbq);
                         if ((cmdiocbq) && (cmdiocbq->iocb_cmpl)) {
-                                spin_unlock_irqrestore(
-                                       phba->host->host_lock, iflag);
-                                (cmdiocbq->iocb_cmpl)(phba, cmdiocbq,
-                                                      &rspiocbq);
-                                spin_lock_irqsave(phba->host->host_lock,
-                                                  iflag);
+                                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,
+                                                              &rspiocbq);
+                                        spin_lock_irqsave(phba->host->host_lock,
+                                                          iflag);
+                                }
                         }
                         break;
                 default: