On Fri, 2014-03-07 at 10:32 -0800, Sarah Sharp wrote:
> On Tue, Feb 11, 2014 at 06:11:09PM +0100, Andreas Cadhalpun wrote:
> > Hi,
> >
> > thanks for looking into the issue.
> >
> > On 11.02.2014 17:40, Sarah Sharp wrote:
> > >On Sat, Feb 08, 2014 at 03:56:31AM +0000, Ben Hutchings wrote:
> > >>For the benefit of other developers, that change is a revert of commit
> > >>459d3c146117 ('usb: xhci: Link TRB must not occur within a USB payload
> > >>burst') plus this effective revert of commit fc76051c453b ('USB: XHCI:
> > >>mark no_sg_constraint'):
> > >
> > >I hope that's unrelated. I was effectively going to do the same thing
> > >upstream (except allow the no_sg_constraint to be set on 0.96 and
> > >earlier hosts).
> >
> > I don't know what else changed from 3.12.8-1 to 3.12.9-1, but this
> > was the only point in the changelog mentioning xhci.
>
> Alan and I concluded that the cause of this issue is clearing the
> no_sg_constraint flag for 1.0 xHCI hosts. The patches to revert the
> commits that caused the issues are on their way to the USB subsystem
> maintainer (Greg):
>
> http://marc.info/?l=linux-kernel&m=139420433008427&w=2
> http://marc.info/?l=linux-kernel&m=139420429908418&w=2
> http://marc.info/?l=linux-kernel&m=139420432208425&w=2
>
> The second commit is needed, since once we allow arbitrarily-aligned
> scatter-gather, the ASIX driver will use it, which causes the USB to
> ethernet adapter to drop packets occasionally.
>
> So we're basically back where we started before 3.12.
[...]
I thought we were already there. Thanks for letting us know about the
additional reverts - I'll apply them in the next Debian update for 3.13.
Ben.
--
Ben Hutchings
I say we take off; nuke the site from orbit. It's the only way to be sure.
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