svn commit: r184558 - head/sys/dev/acpica/Osd
Jung-uk Kim
jkim at FreeBSD.org
Mon Nov 3 07:51:09 PST 2008
On Sunday 02 November 2008 07:50 am, Alexander Motin wrote:
> Author: mav
> Date: Sun Nov 2 12:50:16 2008
> New Revision: 184558
> URL: http://svn.freebsd.org/changeset/base/184558
>
> Log:
> As soon as we have several threads per process now, it is not
> correct to use process ID as ACPI thread ID. Concurrent requests
> with equal thread IDs broke ACPI mutexes operation causing
> unpredictable errors including AE_AML_MUTEX_NOT_ACQUIRED that I
> have seen.
>
> Use kernel thread ID instead of process ID for ACPI thread.
Sorry but this patch is incorrect, i.e., td_tid is not unique. You
have to use curthread or (p_pid, td_tid) pair. Unfortunately, even
if you correct this problem, you also have to correct ACPI_THREAD_ID
definition, which is in the vendor code. That's why it wasn't done
yet and it is more complicated than you think, i.e., ACPI-CA assumes
sizeof(ACPI_THREAD_ID) == sizeof(int), etc. Please see the related
ACPI-CA bugs:
http://www.acpica.org/bugzilla/show_bug.cgi?id=719
http://www.acpica.org/bugzilla/show_bug.cgi?id=732
In fact, I have been maintaining patchsets with the fix here:
http://people.freebsd.org/~jkim/acpica-import-<ACPI_RELEASE>.diff.gz
Please revert this commit until we resolve these issues with the
vendor first.
Thanks!
Jung-uk Kim
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