From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oliver Neukum <oneukum@suse.de>
Subject: Re: [PATCH 2/4] USB: XHCI: mark no_sg_limit
Date: Thu, 01 Aug 2013 10:15:51 +0200
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Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>,
	Ming Lei <ming.lei@canonical.com>,
	"David S. Miller" <davem@davemloft.net>,
	Freddy Xin <freddy@asix.com.tw>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	Ben Hutchings <bhutchings@solarflare.com>,
	Grant Grundler <grundler@google.com>, netdev@vger.kernel.org,
	linux-usb@vger.kernel.org
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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On Thu, 2013-08-01 at 15:30 +0800, Greg Kroah-Hartman wrote:
> On Wed, Jul 31, 2013 at 09:40:26AM -0700, Sarah Sharp wrote:
> > On Wed, Jul 31, 2013 at 06:51:47PM +0800, Ming Lei wrote:
> > > This patch marks all xHCI controllers as no_sg_limit since
> > > xHCI supports building packet from discontinuous buffers.
> > > 
> > > Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
> > > Signed-off-by: Ming Lei <ming.lei@canonical.com>
> > 
> > Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
> 
> Is it a requirement that all xhci controllers support sg?  I know we are
> starting to see other controllers (the platform code?) so would they
> need to support this as well?

The way XHCI describes transfers allows them to be arbitrary.

	Regards
		Oliver