[SCSI] lpfc 8.3.31: Fix driver crash during back-to-back ramp events

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index d5f3fcc3e548..9434b0379abe 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -399,6 +399,14 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
         num_rsrc_err = atomic_read(&phba->num_rsrc_err);
         num_cmd_success = atomic_read(&phba->num_cmd_success);
 
+        /*
+         * The error and success command counters are global per
+         * driver instance.  If another handler has already
+         * operated on this error event, just exit.
+         */
+        if (num_rsrc_err == 0)
+                return;
+
         vports = lpfc_create_vport_work_array(phba);
         if (vports != NULL)
                 for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {