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From:   Daniel Scally <djrscally@gmail.com>
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Subject: [PATCH v3 05/14] software_node: unregister software_nodes in reverse order
Date:   Thu, 24 Dec 2020 01:08:58 +0000
Message-Id: <20201224010907.263125-6-djrscally@gmail.com>
In-Reply-To: <20201224010907.263125-1-djrscally@gmail.com>
References: <20201224010907.263125-1-djrscally@gmail.com>
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To maintain consistency with software_node_unregister_nodes(), reverse
the order in which the software_node_unregister_node_group() function
unregisters nodes.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes in v3
	- Fixed the dereference of the terminating NULL entry
	- Comment cleanup

 drivers/base/swnode.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index ade49173ff8d..2d07eb04c6c8 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -779,16 +779,22 @@ EXPORT_SYMBOL_GPL(software_node_register_node_group);
  * software_node_unregister_node_group - Unregister a group of software nodes
  * @node_group: NULL terminated array of software node pointers to be unregistered
  *
- * Unregister multiple software nodes at once.
+ * Unregister multiple software nodes at once. The array will be unwound in
+ * reverse order (i.e. last entry first) and thus if any member of the array
+ * has its .parent member set then they should appear later in the array such
+ * that they are unregistered first.
  */
 void software_node_unregister_node_group(const struct software_node **node_group)
 {
-	unsigned int i;
+	unsigned int i = 0;
 
 	if (!node_group)
 		return;
 
-	for (i = 0; node_group[i]; i++)
+	while (node_group[i])
+		i++;
+
+	while (i--)
 		software_node_unregister(node_group[i]);
 }
 EXPORT_SYMBOL_GPL(software_node_unregister_node_group);
-- 
2.25.1