[SCSI] qla4xxx: Fixed session destroy issue on link up-down.

During link down, iscsid tries to do re-login to failed session. In case of
link down-up-down, LLD was sending connection login failed event to iscsid,
which is destroying the session, instead we have to continue re-login by
sending connection err event.

JIRA Key: UPSISCSI-134

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 21 insertions, 1 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_init.c b/drivers/scsi/qla4xxx/ql4_init.c
index ca155bb9fd0a..cc10bacd1e18 100644
--- a/drivers/scsi/qla4xxx/ql4_init.c
+++ b/drivers/scsi/qla4xxx/ql4_init.c
@@ -931,6 +931,22 @@ int qla4xxx_process_ddb_changed(struct scsi_qla_host *ha, uint32_t fw_ddb_index,
                         break;
                 }
                 break;
+        case DDB_DS_SESSION_FAILED:
+                switch (state) {
+                case DDB_DS_SESSION_ACTIVE:
+                case DDB_DS_DISCOVERY:
+                        iscsi_conn_login_event(ddb_entry->conn,
+                                               ISCSI_CONN_STATE_LOGGED_IN);
+                        qla4xxx_update_session_conn_param(ha, ddb_entry);
+                        status = QLA_SUCCESS;
+                        break;
+                case DDB_DS_SESSION_FAILED:
+                        iscsi_session_failure(ddb_entry->sess->dd_data,
+                                              ISCSI_ERR_CONN_FAILED);
+                        status = QLA_SUCCESS;
+                        break;
+                }
+                break;
         default:
                 DEBUG2(ql4_printk(KERN_INFO, ha, "%s: Unknown Event\n",
                                 __func__));
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index bea78a7f6bc1..af83e6f3fe6f 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -1158,7 +1158,11 @@ static int qla4xxx_conn_start(struct iscsi_cls_conn *cls_conn)
                 goto exit_conn_start;
         }
 
-        ddb_entry->fw_ddb_device_state = DDB_DS_LOGIN_IN_PROCESS;
+        if (ddb_entry->fw_ddb_device_state == DDB_DS_NO_CONNECTION_ACTIVE)
+                ddb_entry->fw_ddb_device_state = DDB_DS_LOGIN_IN_PROCESS;
+
+        DEBUG2(printk(KERN_INFO "%s: DDB state [%d]\n", __func__,
+                      ddb_entry->fw_ddb_device_state));
 
 exit_set_param:
         iscsi_conn_start(cls_conn);