linux-kernel - Re: [Discussion] USB: musb-gadget: how to fix ZLP issue in musb_g

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Date:	Thu, 16 Sep 2010 15:03:44 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	balbi@...com
CC:	Sergei Shtylyov <sshtylyov@...sta.com>,
	Ming Lei <tom.leiming@...il.com>,
	"greg@...ah.com" <greg@...ah.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	"Gadiyar, Anand" <gadiyar@...com>,
	Mike Frysinger <vapier@...too.org>
Subject: Re: [Discussion] USB: musb-gadget: how to fix ZLP issue in musb_g_tx

Hello.

On 16-09-2010 10:05, Felipe Balbi wrote:

>> I don't see what to rework. The last short packet should still satisfy
>> (request->actual == request->length) condition, no?

> of course not, it's short not zero. so the last short packet can be
> anything from 1 to 511 bytes.

    Sigh. Where have I said anything different? What I meant is that the last 
short packet is already counted in request->actual, otherwise the condition 
(request->actual & (musb_ep->packet_sz - 1)) wouldn't work.

WBR, Sergei
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