Re: [PATCH] serial: core: Fix kmemleak issue for serial core device remove

[Tomi Valkeinen]

On 04/08/2023 12:09, Tony Lindgren wrote:
> Kmemleak reports issues for serial8250 ports after the hardware specific
> driver takes over on boot as noted by Tomi.
>
> The kerneldoc for device_initialize() says we must call device_put()
> after calling device_initialize(). We are calling device_put() on the
> error path, but are missing it from the device remove path. This causes
> release() to never get called for the devices on remove.
>
> Let's add the missing put_device() calls for both serial ctrl and
> port devices.
>
> Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM")
> Reported-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
>   drivers/tty/serial/serial_base_bus.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/tty/serial/serial_base_bus.c b/drivers/tty/serial/serial_base_bus.c
> --- a/drivers/tty/serial/serial_base_bus.c
> +++ b/drivers/tty/serial/serial_base_bus.c
> @@ -99,6 +99,7 @@ void serial_base_ctrl_device_remove(struct serial_ctrl_device *ctrl_dev)
>   		return;
>   
>   	device_del(&ctrl_dev->dev);
> +	put_device(&ctrl_dev->dev);
>   }
>   
>   struct serial_ctrl_device *serial_base_ctrl_add(struct uart_port *port,
> @@ -174,6 +175,7 @@ void serial_base_port_device_remove(struct serial_port_device *port_dev)
>   		return;
>   
>   	device_del(&port_dev->dev);
> +	put_device(&port_dev->dev);
>   }
>   
>   static int serial_base_init(void)

Tested-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>

 Tomi