linux-kernel - Re: [ 12/75] USB: EHCI: work around silicon bug in Intels EHCI controllers

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Message-ID: <20130320202816.GA18496@kroah.com>
Date:	Wed, 20 Mar 2013 13:28:16 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Sven Joachim <svenjoac@....de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Stephen Thirlwall <sdt@...com>
Subject: Re: [ 12/75] USB: EHCI: work around silicon bug in Intels EHCI
 controllers

On Wed, Mar 20, 2013 at 09:14:38PM +0100, Sven Joachim wrote:
> On 2013-03-20 21:08 +0100, Greg Kroah-Hartman wrote:
> 
> > On Tue, Mar 19, 2013 at 10:44:30PM +0100, Sven Joachim wrote:
> >> On 2013-03-19 22:00 +0100, Alan Stern wrote:
> >> 
> >> > On Tue, 19 Mar 2013, Sven Joachim wrote:
> >> >
> >> >> On 2013-03-19 21:10 +0100, Alan Stern wrote:
> >> >> 
> >> >> > On Tue, 19 Mar 2013, Sven Joachim wrote:
> >> >> >
> >> >> >> > In what way is resume broken?
> >> >> >> 
> >> >> >> The kernel comes back, but the screen is black.  Manually switching VT's
> >> >> >> is possible, and if I type something I can see it on the screen, but
> >> >> >> there is no response and the cursor does not blink.  It looks as if the
> >> >> >> VT is not switched backed on resume, and userspace tasks are not
> >> >> >> restarted.  Sysrq combinations apparently work, but produce no output.
> >> >> >
> >> >> > Are there any other problems?  For example, even before you do a 
> >> >> > suspend, if you type Alt-SysRq-W do you see any processes listed?
> >> >> 
> >> >> No.
> >> >> 
> >> >> > There was another report on the linux-usb mailing list today of this
> >> >> > same patch causing the khubd task to hang.  I'm thinking that you might
> >> >> > be facing a similar problem.
> >> >> 
> >> >> Maybe, but before the suspend everything seems to be normal.
> >> >
> >> > Just out of curiosity, does the patch posted here:
> >> >
> >> > 	http://marc.info/?l=linux-usb&m=136361874807411&w=2
> >> >
> >> > make any difference?
> >> 
> >> It fixes the problem for me, thanks. :-)
> >
> > Ok, I'll postpone this patch for the next stable release, in time for
> > the fix to be put in at the same time.
> 
> I think patch 13/75 ("USB: EHCI: dont check DMA values in QH overlays")
> should also be postponed then, at least Alan said so in
> <Pine.LNX.4.44L0.1303191125100.15684-100000@...rider.rowland.org>.

Crap, I didn't postpone that one, hopefully it doesn't cause as many
problems...

greg k-h
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