On 03.07.23 10:54, Sascha Hauer wrote:
> On Thu, Jun 29, 2023 at 08:56:12AM +0200, Ahmad Fatoum wrote:
>> Reparenting nodes can be a useful thing to do in fixups. Add a helper
>> for that.
>>
>> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
>> ---
>> v1 -> v2:
>> - rename from of_move_node to of_reparent_node
>> - ensure that there's a parent to avoid null pointer deref
>> (Sascha)
>> - set node->parent to new_parent (Sascha)
>> - Remove broken condition on old parent (Sascha)
>> ---
>> drivers/of/base.c | 26 ++++++++++++++++++++++++++
>> include/of.h | 1 +
>> test/self/of_manipulation.c | 8 ++++++--
>> 3 files changed, 33 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/of/base.c b/drivers/of/base.c
>> index 4dc1c76b136d..e1134e9c694b 100644
>> --- a/drivers/of/base.c
>> +++ b/drivers/of/base.c
>> @@ -2697,6 +2697,32 @@ void of_delete_node(struct device_node *node)
>> free(node);
>> }
>>
>> +/*
>> + * of_reparent_node - Move node from beneath one parent to another
>> + * @new_parent: The new parent node
>> + * @node The node to be moved
>> + */
>> +int of_reparent_node(struct device_node *new_parent, struct device_node *node)
>> +{
>> + if (!node)
>> + return 0;
>> +
>> + if (!new_parent || !node->parent)
>> + return -EINVAL;
>> +
>> + list_del(&node->parent_list);
>> + list_del(&node->list);
>
> You could put these list operations into a if (node->parent), then @node
> wouldn't necessarily need a parent.
A node without a parent doesn't have a name, that's why I limited
it to nodes that have a parent.
>
>> +
>> + free(node->full_name);
>> + node->full_name = basprintf("%s/%s", new_parent->full_name, node->name);
>
> That fixes full_name of @node, but not its children.
>
> One obvious solution would be to iterate over the children and fix the
> name recursively. Another one would be to git rid of the full_name
> member and generate the name dynamically when needed, but that wouldn't be
> master material anymore.
Argh.. Thanks for noticing.
>
> Sascha
>
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