[PATCH 2.6.32.stable] ACPI: don't cond_resched if irq is disabled

From: Len Brown
Date: Sat Jan 23 2010 - 14:14:40 EST

From: Xiaotian Feng <dfeng@xxxxxxxxxx>

upstream c084ca704a3661bf77690a05bc6bd2c305d87c34

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@xxxxxxxxxxxx>
Reported-and-bisected-by: Justin P. Mattock <justinmattock@xxxxxxxxx>
Signed-off-by: Xiaotian Feng <dfeng@xxxxxxxxxx>
Acked-by: Alexey Starikovskiy <astarikovskiy@xxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
include/acpi/platform/aclinux.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 9d7febd..0946997 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -152,7 +152,7 @@ static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
#include <linux/hardirq.h>
do { \
- if (!in_atomic_preempt_off()) \
+ if (!in_atomic_preempt_off() && !irqs_disabled()) \
cond_resched(); \
} while (0)


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