[SCSI] qla4xxx: Fix multiple conn login event issue during session recovery.

During iscsid session recovery driver sends multiple ISCSI_CONN_STATE_LOGGED_IN
event from qla4xxx_conn_start() and qla4xxx_ddb_change(), which causes iscsid
to crash.

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>

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 77a969a..9c3442d 100644 (file)
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -3168,6 +3168,7 @@ int qla4xxx_unblock_ddb(struct iscsi_cls_session *cls_session)
        struct iscsi_session *sess;
        struct ddb_entry *ddb_entry;
        struct scsi_qla_host *ha;
+       int status = QLA_SUCCESS;
 
        sess = cls_session->dd_data;
        ddb_entry = sess->dd_data;
@@ -3175,11 +3176,20 @@ int qla4xxx_unblock_ddb(struct iscsi_cls_session *cls_session)
        ql4_printk(KERN_INFO, ha, "scsi%ld: %s: ddb[%d]"
                   " unblock user space session\n", ha->host_no, __func__,
                   ddb_entry->fw_ddb_index);
-       iscsi_conn_start(ddb_entry->conn);
-       iscsi_conn_login_event(ddb_entry->conn,
-                              ISCSI_CONN_STATE_LOGGED_IN);
 
-       return QLA_SUCCESS;
+       if (!iscsi_is_session_online(cls_session)) {
+               iscsi_conn_start(ddb_entry->conn);
+               iscsi_conn_login_event(ddb_entry->conn,
+                                      ISCSI_CONN_STATE_LOGGED_IN);
+       } else {
+               ql4_printk(KERN_INFO, ha,
+                          "scsi%ld: %s: ddb[%d] session [%d] already logged in\n",
+                          ha->host_no, __func__, ddb_entry->fw_ddb_index,
+                          cls_session->sid);
+               status = QLA_ERROR;
+       }
+
+       return status;
 }
 
 static void qla4xxx_relogin_all_devices(struct scsi_qla_host *ha)