[PATCH 5.11 185/306] software node: Fix node registration

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: Heikki Krogerus <heikki.krogerus@linux.intel.com>

commit 8891123f9cbb9c1ee531e5a87fa116f0af685c48 upstream.

Software node can not be registered before its parent.

Fixes: 80488a6b1d3c ("software node: Add support for static node descriptors")
Cc: 5.10+ <redacted> # 5.10+
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/base/swnode.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c

@@ -786,6 +786,9 @@ int software_node_register(const struct
 	if (software_node_to_swnode(node))
 		return -EEXIST;
 
+	if (node->parent && !parent)
+		return -EINVAL;
+
 	return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
 }
 EXPORT_SYMBOL_GPL(software_node_register);