linux-kernel - [PATCH -V2] acpi: don't cond

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Date:	Thu, 10 Dec 2009 19:56:45 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Xiaotian Feng <dfeng@...hat.com>,
	Len Brown <lenb@...nel.org>,
	Bob Moore <robert.moore@...el.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Pavel Machek <pavel@....cz>
Subject: [PATCH -V2] acpi: don't cond_resched if irq is disabled

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@...inger.net>
Reported-and-bisected-by: Justin P. Mattock <justinmattock@...il.com>
Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
Cc: Len Brown <lenb@...nel.org>
Cc: Bob Moore <robert.moore@...el.com>
Cc: Lin Ming <ming.m.lin@...el.com>
Cc: Alexey Starikovskiy <astarikovskiy@...e.de>
Cc: Pavel Machek <pavel@....cz>
---
 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>
 #define ACPI_PREEMPTION_POINT() \
 	do { \
-		if (!in_atomic_preempt_off()) \
+		if (!in_atomic_preempt_off() && !irqs_disabled()) \
 			cond_resched(); \
 	} while (0)
 
-- 
1.6.5.2

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