lkml.org 
[lkml]   [2016]   [Jul]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] usb: gadget: f_midi: Add checking if it need align buffer's size to an ep's maxpacketsize
Date
> Baolin Wang <baolin.wang@linaro.org> writes:
>> @@ -359,10 +361,12 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>>
>> /* allocate a bunch of read buffers and queue them all at once. */
>> for (i = 0; i < midi->qlen && err == 0; i++) {
>> - struct usb_request *req =
>> - midi_alloc_ep_req(midi->out_ep,
>> - max_t(unsigned, midi->buflen,
>> - bulk_out_desc.wMaxPacketSize));
>> + struct usb_request *req;
>> +
>> + length = usb_ep_align_maybe(midi->gadget, midi->out_ep,
>> + midi->buflen);

On Fri, Jul 08 2016, Felipe Balbi wrote:
> after calling usb_ep_align_maybe()...
>
>> + req = midi_alloc_ep_req(midi->out_ep,
>> + max_t(unsigned, length, bulk_out_desc.wMaxPacketSize));
>
> ... max_t() is pointless. length will *always* >= wMaxPacketSize.

That is only true for gadgets with the quirk. usb_ep_align_maybe is
a noöp for gadgets without the quirk.

--
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

\
 
 \ /
  Last update: 2016-07-08 16:41    [W:0.128 / U:0.376 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site