linux-kernel - [PATCH v3 05/14] software_node: unregister software

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Date:   Thu, 24 Dec 2020 01:08:58 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...ica.org
Cc:     rjw@...ysocki.net, lenb@...nel.org, gregkh@...uxfoundation.org,
        yong.zhi@...el.com, sakari.ailus@...ux.intel.com,
        bingbu.cao@...el.com, tian.shu.qiu@...el.com, mchehab@...nel.org,
        robert.moore@...el.com, erik.kaneda@...el.com, pmladek@...e.com,
        rostedt@...dmis.org, sergey.senozhatsky@...il.com,
        andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
        laurent.pinchart+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org, kieran.bingham+renesas@...asonboard.com,
        hverkuil-cisco@...all.nl, m.felsch@...gutronix.de,
        niklas.soderlund+renesas@...natech.se, slongerbeam@...il.com,
        heikki.krogerus@...ux.intel.com, linus.walleij@...aro.org,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCH v3 05/14] software_node: unregister software_nodes in reverse order

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@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Daniel Scally <djrscally@...il.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