linux-kernel - Re: [PATCH] usb: gadget: f_midi: Fixed a bug when buflen was smaller than wMaxPacketSize

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Message-ID: <56FE3E90.9020305@felipetonello.com>
Date:	Fri, 1 Apr 2016 10:25:36 +0100
From:	Felipe Ferreri Tonello <eu@...ipetonello.com>
To:	Michal Nazarewicz <mina86@...a86.com>,
	Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: Re: [PATCH] usb: gadget: f_midi: Fixed a bug when buflen was smaller
 than wMaxPacketSize

Hi Balbi and Mina,

On 30/03/16 13:33, Michal Nazarewicz wrote:
> On Wed, Mar 30 2016, Felipe Balbi wrote:
>> a USB packet, right. that's correct. But a struct usb_request can
>> point to whatever size buffer it wants and UDC is required to split
>> that into wMaxPacketSize transfers.
> 
> D’oh.  Of course.  Disregard all my comments on the patch (except for
> Ack).
> 

I didn't really get it. Does that mean that if buflen is multiple of
wMaxPacketSize, the UDC driver should fit as many [DATA] packets into
one usb_request and call complete() or it will always call complete() on
each [DATA] packet, thus not requiring buflen at all?

Does that mean that we can still use buflen and this patch is still
valid? (besides the endianess issue that was addressed on v2)

-- 
Felipe

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