+/**
+ * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
+ * cmd: scsi cmd passed to scsi eh handler
+ *
+ * If the session is down this function will wait for the recovery
+ * timer to fire or for the session to be logged back in. If the
+ * recovery timer fires then FAST_IO_FAIL is returned. The caller
+ * should pass this error value to the scsi eh.
+ */
+int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
+{
+ struct iscsi_cls_session *session =
+ starget_to_session(scsi_target(cmd->device));
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&session->lock, flags);
+ while (session->state != ISCSI_SESSION_LOGGED_IN) {
+ if (session->state == ISCSI_SESSION_FREE) {
+ ret = FAST_IO_FAIL;
+ break;
+ }
+ spin_unlock_irqrestore(&session->lock, flags);
+ msleep(1000);
+ spin_lock_irqsave(&session->lock, flags);
+ }
+ spin_unlock_irqrestore(&session->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
+