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    Subject[PATCH 12/13] powernow-k8 crash workaround
    -stable review patch.  If anyone has any objections, please let us know.
    ------------------

    From: Andrew Morton <akpm@osdl.org>

    Work around the oops reported in
    http://bugzilla.kernel.org/show_bug.cgi?id=6478.

    Thanks to Ralf Hildebrandt <ralf.hildebrandt@charite.de> for testing and
    reporting.

    Acked-by: Dave Jones <davej@codemonkey.org.uk>
    Cc: "Len Brown" <len.brown@intel.com>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---

    drivers/acpi/processor_perflib.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    --- linux-2.6.16.21.orig/drivers/acpi/processor_perflib.c
    +++ linux-2.6.16.21/drivers/acpi/processor_perflib.c
    @@ -577,6 +577,8 @@ acpi_processor_register_performance(stru
    return_VALUE(-EBUSY);
    }

    + WARN_ON(!performance);
    +
    pr->performance = performance;

    if (acpi_processor_get_performance_info(pr)) {
    @@ -609,7 +611,8 @@ acpi_processor_unregister_performance(st
    return_VOID;
    }

    - kfree(pr->performance->states);
    + if (pr->performance)
    + kfree(pr->performance->states);
    pr->performance = NULL;

    acpi_cpufreq_remove_file(pr);
    --
    -
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