Re: [PATCH net-next] net: dsa: mv88e6xxx: fix unreleased fwnode_handle in setup_port()

[Javier Carrasco]

On 19/10/2024 23:59, Andrew Lunn wrote:
> On Sat, Oct 19, 2024 at 10:16:49PM +0200, Javier Carrasco wrote:
>> 'ports_fwnode' is initialized via device_get_named_child_node(), which
>> requires a call to fwnode_handle_put() when the variable is no longer
>> required to avoid leaking memory.
>>
>> Add the missing fwnode_handle_put() after 'ports_fwnode' has been used
>> and is no longer required.
> 
> As you point out, the handle is obtained with
> device_get_named_child_node(). It seems odd to use a fwnode_ function
> not a device_ function to release the handle. Is there a device_
> function?
> 
> 	Andrew


Hi Andrew,

device_get_named_child_node() receives a pointer to a *device*, and
returns a child node (a pointer to an *fwnode_handle*). That is what has
to be released, and therefore fwnode_handle_put() is the right one.

Note that device_get_named_child_node() documents how to release the
fwnode pointer:

"The caller is responsible for calling fwnode_handle_put() on the
returned fwnode pointer."

Best regards,
Javier Carrasco