Felipe Tonello wrote:
> req->actual == req->length means that there is no data left to enqueue,
This condition is not checked in the patch.
> so free the request.
>
> Signed-off-by: Felipe F. Tonello <e...@felipetonello.com>
> ---
> drivers/usb/gadget/function/f_midi.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
> diff --git a/drivers/usb/gadget/function/f_midi.c
> b/drivers/usb/gadget/function/f_midi.c
> index edb84ca..93212ca 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -256,9 +256,8 @@ f_midi_complete(struct usb_ep *ep, struct usb_request
> *req)
> /* We received stuff. req is queued again, below */
> f_midi_handle_out_data(ep, req);
> } else if (ep == midi->in_ep) {
> - /* Our transmit completed. See if there's more to go.
> - * f_midi_transmit eats req, don't queue it again. */
> - f_midi_transmit(midi, req);
> + /* Our transmit completed. Don't queue it again. */
> + free_ep_req(ep, req);
> return;
> }
> break;
The ALSA framework will give you a notification _once_. If the
resulting data is larger than midi->buflen, then you have to continue
sending packets. This is exactly what the call to f_midi_transmit()
does.
(To decrease latency, it might be a good idea to queue multiple requests,
but you wouldn't want to continue piling up requests if the host isn't
listening. sound/usb/midi.c just allocates a fixed number of requests,
and always reuses them.)
Regards,
Clemens
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