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    SubjectRe: 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@pacbell.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@users.sourceforge.net>
    Tested-by: Gordon Farquharson <gordonfarquharson@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.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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