linux-kernel - Re: [PATCH 2/3] usb: dwc2: host: Giveback URB in tasklet context

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Date:	Sat, 7 Nov 2015 10:09:44 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Doug Anderson <dianders@...omium.org>
cc:	John Youn <John.Youn@...opsys.com>, Felipe Balbi <balbi@...com>,
	Yunzhi Li <lyz@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Julius Werner <jwerner@...omium.org>,
	"Herrero, Gregory" <gregory.herrero@...el.com>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	John Youn <johnyoun@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ming Lei <ming.lei@...onical.com>
Subject: Re: [PATCH 2/3] usb: dwc2: host: Giveback URB in tasklet context

On Fri, 6 Nov 2015, Doug Anderson wrote:

> You're talking to someone who has only been looking at the details of
> USB for about 2 days now.  :-P  ...I'm trying to grok all of that, but
> I'm not sure I got it all...
> 
> I will say that "URB_ISO_ASAP" is not referenced anywhere in dwc2.
> Presumably that's a bug (or missing feature).  Would it be terrible if
> I just ignored that for now and said that if you try to add something
> to the queue and we're currently in the process of waiting for our
> timer to expire then you'll just get back -ENOSPC?  dwc2 won't deal
> perfectly well if you've very close to exhausting the available
> bandwidth, but that could be a task for another day.

Sure.  It's not necessary to support everything perfectly, right from
the beginning.

Alan Stern

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