netdev - Re: [PATCH] USBNET: fix handling padding packet

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Date:	Thu, 19 Sep 2013 08:57:23 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	Ming Lei <ming.lei@...onical.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Network Development <netdev@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] USBNET: fix handling padding packet

On Wed, 2013-09-18 at 20:56 +0200, Bjørn Mork wrote:
> Oliver Neukum <oneukum@...e.de> wrote:

> >No, USB 3.0 uses no companion controllers, so you can have devices
> >of any speed connected to it.
> >
> 
> Ah, right. I don't own such modern hardware, but I should have known this anyway. 
> 
> This still doesn't change the fact that the driver is brand new for brand new devices. I believe we should assume such devices will support ZLPs unless we have documentation stating anything else.

For such devices we might assume it. But how does that matter for
generic code? As any kind of device may be connected to XHCI, the sg
code is relevant for every driver. And I certainly don't want trouble
for older devices' drivers converted to sg.

	Regards
		Oliver


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