On Thu, Mar 11, 2021 at 07:03:54AM -0800, Lv Yunlong wrote:
> In the implementation of usbtmc_free_int(), it already calls
> kref_put() to free the data as shown below. So, in
> usbtmc_disconnect, call an extra kref_put() is redundant.
>
> """
> static void usbtmc_free_int(struct usbtmc_device_data *data)
> {
> if (!data->iin_ep_present || !data->iin_urb)
> return;
> usb_kill_urb(data->iin_urb);
> kfree(data->iin_buffer);
> data->iin_buffer = NULL;
> usb_free_urb(data->iin_urb);
> data->iin_urb = NULL;
> kref_put(&data->kref, usbtmc_delete);
> }
> """
>
> Signed-off-by: Lv Yunlong <lyl2...@mail.ustc.edu.cn>
> ---
> drivers/usb/class/usbtmc.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
> index 74d5a9c5238a..adcdd2df1949 100644
> --- a/drivers/usb/class/usbtmc.c
> +++ b/drivers/usb/class/usbtmc.c
> @@ -2494,7 +2494,6 @@ static void usbtmc_disconnect(struct usb_interface
> *intf)
> }
> mutex_unlock(&data->io_mutex);
> usbtmc_free_int(data);
> - kref_put(&data->kref, usbtmc_delete);
Did you test this change?
If not, please do so, I think the code is fine as-is.
thanks,
greg k-h
