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    Subject[03/98] ACPI: dont cond_resched if irq is disabled
    2.6.32-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Xiaotian Feng <dfeng@redhat.com>

    commit c084ca704a3661bf77690a05bc6bd2c305d87c34 upstream.

    commit 8bd108d adds preemption point after each opcode parse, then
    a sleeping function called from invalid context bug was founded
    during suspend/resume stage. this was fixed in commit abe1dfa by
    don't cond_resched when irq_disabled. But recent commit 138d156 changes
    the behaviour to don't cond_resched when in_atomic. This makes the
    sleeping function called from invalid context bug happen again, which
    is reported in http://lkml.org/lkml/2009/12/1/371.

    This patch also fixes http://bugzilla.kernel.org/show_bug.cgi?id=14483

    Reported-and-bisected-by: Larry Finger <Larry.Finger@lwfinger.net>
    Reported-and-bisected-by: Justin P. Mattock <justinmattock@gmail.com>
    Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
    Acked-by: Alexey Starikovskiy <astarikovskiy@suse.de>
    Signed-off-by: Len Brown <len.brown@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    include/acpi/platform/aclinux.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/include/acpi/platform/aclinux.h
    +++ b/include/acpi/platform/aclinux.h
    @@ -152,7 +152,7 @@ static inline void *acpi_os_acquire_obje
    #include <linux/hardirq.h>
    #define ACPI_PREEMPTION_POINT() \
    do { \
    - if (!in_atomic_preempt_off()) \
    + if (!in_atomic_preempt_off() && !irqs_disabled()) \
    cond_resched(); \
    } while (0)




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