linux-kernel - Re: [RESEND/PATCH 5/6] USB: musb-gadget: complete request only if data is transfered over

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Message-ID: <AANLkTi=A+1ThrRTNjWoFbXr-G1OUnpThEwG5rCgGirzC@mail.gmail.com>
Date:	Wed, 15 Sep 2010 18:14:51 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	balbi@...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: [RESEND/PATCH 5/6] USB: musb-gadget: complete request only if
 data is transfered over

2010/9/15 Sergei Shtylyov <sshtylyov@...sta.com>:
> Hello.
>
> On 15-09-2010 14:05, Felipe Balbi wrote:
>
>>> I didn't say it was duplicate for DMA, just too late.
>
>> how come ? we need to send ZLP before giving back the request.
>
>   Well, look at the code ionce again. We need to send ZLP *after*
> request->actual == request->length, but as the check is inserted after the
> ZLP send, ZLP *may* be sent once the first DMA completes, not the last.

Yes, it is really a problem, as said by balbi.  And the problem should be
in the check for zlp or the 'is_dma' condition.

But this patch is not addressed for the zlp problem, and is is only for
completing the request only if the data transfer in usb_request
is over, as explained before, right?

-- 
Lei Ming
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