linux-kernel - Re: [PATCH v3 1/4] usb: gadget: f_midi: free usb request when done

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Date:	Sun, 11 Oct 2015 21:08:32 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Felipe Balbi <balbi@...com>, Felipe Tonello <eu@...ipetonello.com>,
	USB list <linux-usb@...r.kernel.org>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	Peter Chen <Peter.Chen@...escale.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Subject: Re: [PATCH v3 1/4] usb: gadget: f_midi: free usb request when done

Felipe Balbi wrote:
> Clemens Ladisch <clemens@...isch.de> writes:
>> 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 <eu@...ipetonello.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.
>
> so, should I drop this series from my TODO queue ?

Yes, this patch needs to be dropped.


Regards,
Clemens
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