On Thu, 26 May 2022 18:52:08 +0400
Miaoqian Lin <[email protected]> wrote:
> of_get_child_by_name() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when done.
>
> mv88e6xxx_mdio_register() pass the device node to of_mdiobus_register().
> We don't need the device node after it.
>
> Add missing of_node_put() to avoid refcount leak.
>
> Fixes: a3c53be55c95 ("net: dsa: mv88e6xxx: Support multiple MDIO busses")
> Signed-off-by: Miaoqian Lin <[email protected]>
> ---
> changes in v2:
> - Add fixes tag.
> changes in v3:
> - Move of_node_put() statement to cover normal path.
> - Update commit message.
>
> I do cross-check to determine we should release the node after
> of_mdiobus_register(), refer to functions like lan78xx_mdio_init(),
> ave_init() and ag71xx_mdio_probe().
>
> v1 link: https://lore.kernel.org/r/[email protected]/
> v2 link: https://lore.kernel.org/all/[email protected]/
> ---
> drivers/net/dsa/mv88e6xxx/chip.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index 5d2c57a7c708..0b49d243e00b 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -3960,6 +3960,7 @@ static int mv88e6xxx_mdios_register(struct mv88e6xxx_chip *chip,
> */
> child = of_get_child_by_name(np, "mdio");
> err = mv88e6xxx_mdio_register(chip, child, false);
> + of_node_put(child);
> if (err)
> return err;
>
Reviewed-by: Marek Behún <[email protected]>