linux-kernel - Re: 2.6.25-rc6 hangs at resume after suspend to RAM on Mac mini Core Duo

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Date:	Tue, 1 Apr 2008 20:37:32 +0200
From:	Tino Keitel <tino.keitel@....de>
To:	Pavel Machek <pavel@....cz>, linux-usb@...r.kernel.org
Cc:	Soeren Sonnenburg <sonne@....de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>
Subject: Re: 2.6.25-rc6 hangs at resume after suspend to RAM on Mac mini
	Core Duo

On Tue, Apr 01, 2008 at 12:52:13 +0200, Pavel Machek wrote:
> Hi!
> 
> > > > [...]
> > > > 
> > > > > Can you please try to boot with acpi_new_pts_ordering and retest?
> > > > 
> > > > I just tried current -git (a9edadbf790d72adf6ebed476cb5caf7743e7e4a),
> > > > without success. I still got the same hand at resume.
> > > 
> > > I am having the hang on resume problem too (macbook pro), cf.
> > > http://bugzilla.kernel.org/show_bug.cgi?id=10319, 2.6.24 was fine.
> > 
> > What about 2.6.25-rc5? Up to this, resume works for me. -rc6 is broken.
> 
> Any chance to bisect?

git-bisect revealed this:

$ git bisect good
e82cc1288fa57857c6af8c57f3d07096d4bcd9d9 is first bad commit
commit e82cc1288fa57857c6af8c57f3d07096d4bcd9d9
Author: David Brownell <david-b@...bell.net>
Date:   Fri Mar 7 13:49:42 2008 -0800

    USB: fix ehci unlink regressions
    
    The recent EHCI driver update to split the IAA watchdog timer out from
    the other timers made several things work better, but not everything;
    and it created a couple new issues in bugzilla.  Ergo this patch:
    
      - Handle a should-be-rare SMP race between the watchdog firing
        and (very late) IAA interrupts;
    
      - Remove a shouldn't-have-been-added WARN_ON() test;
    
      - Guard against one observed OOPS;
    
      - If this watchdog fires during clean HC shutdown, it should act
        as a NOP instead of interfering with the shutdown sequence;
    
      - Guard against silicon errata hypothesized by some vendors:
          * IAA status latch broken, but IAAD cleared OK;
          * IAAD wasn't cleared when IAA status got reported;
    
    The WARN_ON is in bugzilla as 10168; the OOPS as 10078; these are
    both regressions.
    
    Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
    Tested-by: Gordon Farquharson <gordonfarquharson@...il.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

:040000 040000 ff621bb62396fdf71c7b97877ddbb8542f57b871
251bc90076ea0b3a14d0b88dd250581fa815b5de M	drivers

For the linux-usb people: this commit breaks resume from suspend to RAM
on my Mac mini Core Duo. It worked with 2.6.24, 2.6.25-rc5, and was
broken since 2.6.25-rc6 (also with -rc7 and later). See
http://lkml.org/lkml/2008/3/20/23 for more information.

Regards,
Tino
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