On Fri, Aug 22, 2025 at 10:01:58AM +0800, William Wu wrote: > If the hid transfer with size divisible to EPs max packet > size, it needs to set the req->zero to true, then the usb > controller can transfer a zero length packet at the end > according to the USB 2.0 spec. > > Signed-off-by: William Wu <william.wu@xxxxxxxxxxxxxx> > --- > drivers/usb/gadget/function/f_hid.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c > index 8e1d1e8..8021af3 100644 > --- a/drivers/usb/gadget/function/f_hid.c > +++ b/drivers/usb/gadget/function/f_hid.c > @@ -511,7 +511,7 @@ static ssize_t f_hidg_write(struct file *file, const char __user *buffer, > } > > req->status = 0; > - req->zero = 0; > + req->zero = ((count % hidg->in_ep->maxpacket) == 0); > req->length = count; > req->complete = f_hidg_req_complete; > req->context = hidg; > @@ -967,7 +967,7 @@ static int hidg_setup(struct usb_function *f, > return -EOPNOTSUPP; > > respond: > - req->zero = 0; > + req->zero = ((length % cdev->gadget->ep0->maxpacket) == 0); > req->length = length; > status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); > if (status < 0) What commit id does this fix? thanks, greg k-h