On Fri, Dec 06, 2019 at 04:37:32PM +0100, Daniele Palmas wrote:
> Telit FN980 flashing device 0x1bc7/0x9010 requires zero packet
> to be sent if out data size is equal to the endpoint max size.
>
> Signed-off-by: Daniele Palmas <dnlplm@xxxxxxxxx>
> ---
> V2: removed transfer_length calculations
> diff --git a/drivers/usb/serial/usb-wwan.h b/drivers/usb/serial/usb-wwan.h
> index 1c120eaf4091..934e9361cf6b 100644
> --- a/drivers/usb/serial/usb-wwan.h
> +++ b/drivers/usb/serial/usb-wwan.h
> @@ -38,6 +38,7 @@ struct usb_wwan_intf_private {
> spinlock_t susp_lock;
> unsigned int suspended:1;
> unsigned int use_send_setup:1;
> + unsigned int use_zlp:1;
> int in_flight;
> unsigned int open_ports;
> void *private;
> diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
> index 7e855c87e4f7..5e5a284a4ba3 100644
> --- a/drivers/usb/serial/usb_wwan.c
> +++ b/drivers/usb/serial/usb_wwan.c
> @@ -228,6 +228,8 @@ int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
> } else {
> intfdata->in_flight++;
> spin_unlock_irqrestore(&intfdata->susp_lock, flags);
> + if (intfdata->use_zlp)
> + this_urb->transfer_flags |= URB_ZERO_PACKET;
Just set it once when allocating the URBs at port_probe.
> err = usb_submit_urb(this_urb, GFP_ATOMIC);
> if (err) {
> dev_err(&port->dev,
Johan
