netdev - RE: [PATCH RFC 1/1] usb: Tell xhci when usb data might be misaligned

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Date:	Fri, 31 Jan 2014 15:22:37 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Sarah Sharp' <sarah.a.sharp@...ux.intel.com>,
	Bjørn Mork <bjorn@...k.no>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Miller <davem@...emloft.net>,
	"Dan Williams" <dan.j.williams@...el.com>,
	"Nyman, Mathias" <mathias.nyman@...el.com>,
	Mark Lord <mlord@...ox.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Freddy Xin <freddy@...x.com.tw>,
	Ming Lei <ming.lei@...onical.com>
Subject: RE: [PATCH RFC 1/1] usb: Tell xhci when usb data might be misaligned

From: Sarah Sharp
> On Thu, Jan 30, 2014 at 10:50:21PM +0100, Bjørn Mork wrote:
> > FWIW, the plan looks fine to me.  Just adding a couple of hints to
> > simplify the implementation.
> >
> > Sarah Sharp <sarah.a.sharp@...ux.intel.com> writes:
> >
> > > Let's do this fix the right way, instead of wall papering over the
> > > issue.  Here's what we should do:
> > >
> > > 1. Disable scatter-gather for the ax88179_178a driver when it's under an
> > >    xHCI host.
> >
> > No need to make this conditional.  SG is only enabled in the
> > ax88179_178a driver if udev->bus->no_sg_constraint is true, so it
> > applies only to xHCI hosts in the first place.

Leave the usbnet code alone and unset udev->bus->no_sg_constraint.

	David



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