linux-kernel - [03/98] ACPI: dont cond_resched if irq is disabled

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Date:	Tue, 26 Jan 2010 15:33:29 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Xiaotian Feng <dfeng@...hat.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Len Brown <len.brown@...el.com>
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@...hat.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@...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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.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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