In the Linux kernel, the following vulnerability has been resolved: gpio/rockchip: fix refcount leak in rockchip_gpiolib_register() The node returned by of_get_parent() with refcount incremented, of_node_put() needs be called when finish using it. So add it in the end of of_pinctrl_get().
https://git.kernel.org/stable/c/63ff545af73f759d1bd04198af8ed8577fb739fc
https://git.kernel.org/stable/c/5cb8f1a784fd6115be58282fe15105572319d8be
https://git.kernel.org/stable/c/033c79b7ee8a7bf1c1a13ac3addc91184425cbae