+	mutex_lock(&subsys->lock);
+	list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
+		connected = true;
+		break;
+	}
+	mutex_unlock(&subsys->lock);

This could just use list_empty.  But we'd also need to hold the lock
over the actual change of the model number to avoid a race window.

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