component: do not try to unbind unbound components

Error handling is apparently hard and driver authors often get it wrong.

Continue to warn but do not try to unbind components that have never
been bound in order to avoid crashing systems where such a buggy
teardown path is hit.

Signed-off-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: jhovold

drivers/base/component.c

@@ -586,7 +586,8 @@ EXPORT_SYMBOL_GPL(component_master_is_bound);
 static void component_unbind(struct component *component,
 	struct aggregate_device *adev, void *data)
 {
-	WARN_ON(!component->bound);
+	if (WARN_ON(!component->bound))
+		return;
 
 	dev_dbg(adev->parent, "unbinding %s component %p (ops %ps)\n",
 		dev_name(component->dev), component, component->ops);