linux-kernel - [PATCH 2.6.32.stable] ACPI: don't cond

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Message-id: <alpine.LFD.2.00.1001231411540.5156@localhost.localdomain>
Date:	Sat, 23 Jan 2010 14:14:11 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	stable@...nel.org
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	"Justin P. Mattock" <justinmattock@...il.com>,
	Xiaotian Feng <dfeng@...hat.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 2.6.32.stable] ACPI: don't cond_resched if irq is disabled

From: Xiaotian Feng <dfeng@...hat.com>

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@...inger.net>
Reported-and-bisected-by: Justin P. Mattock <justinmattock@...il.com>
Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
Acked-by: Alexey Starikovskiy <astarikovskiy@...e.de>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 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)
 
-- 
1.6.6.1.383.g5a9f

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