linux-kernel - Re: [PATCH] ACPICA: don't cond_resched() when irq_disabled or in

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Date:	Fri, 04 Dec 2009 13:36:57 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	"lenb@...nel.org" <lenb@...nel.org>,
	"Lin, Ming M" <ming.m.lin@...el.com>,
	"Moore, Robert" <robert.moore@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPICA: don't cond_resched() when irq_disabled or
 in_atomic

CC Alexey.

And this is also the fix for
http://bugzilla.kernel.org/show_bug.cgi?id=14483

thanks,
rui

On Fri, 2009-12-04 at 12:26 +0800, Xiaotian Feng wrote:
> 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.
> 
> The fix is to cond_sched() only when preemptible, which means not in
> irq_disabled or in_atomic.
> 
> Reported-and-bisected-by: Larry Finger <Larry.Finger@...inger.net>
> Signed-off-by: Xiaotian Feng <dfeng@...hat.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..5b415ee 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 (preemptible()) \
>  			cond_resched(); \
>  	} while (0)
>  


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