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Message-ID: <2674af740911040449h14eaac35y2ec3016862479bc6@mail.gmail.com>
Date: Wed, 4 Nov 2009 20:49:41 +0800
From: Yong Zhang <yong.zhang0@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Prarit Bhargava <prarit@...hat.com>, linux-kernel@...r.kernel.org,
ebiederm@...ssion.com, akpm@...ux-foundation.org,
Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH]: use spin_lock_irqsave in try_one_irq()
On Wed, Nov 4, 2009 at 5:18 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, 3 Nov 2009, Yong Zhang wrote:
>
>> > This happens because the &desc->lock is taken with spin_lock_irqsave and
>> > just a spin_lock. In the try_one_irq(), this lock really should be a
>> > spin_lock_irqsave().
>> >
>> So I think the following patch is also workable to you.
>
> Yes, that's sufficient.
>
>> diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
>> index 114e704..11affbc 100644
>> --- a/kernel/irq/spurious.c
>> +++ b/kernel/irq/spurious.c
>> @@ -111,6 +111,7 @@ static void poll_all_shared_irqs(void)
>>
>> for_each_irq_desc(i, desc) {
>> unsigned int status;
>> + unsigned long flags;
>>
>> if (!i)
>> continue;
>> @@ -121,7 +122,9 @@ static void poll_all_shared_irqs(void)
>> if (!(status & IRQ_SPURIOUS_DISABLED))
>> continue;
>>
>> + local_irq_save(flags);
>> try_one_irq(i, desc);
>> + local_irq_restore(flags);
>
> You can even use local_irq_en/disable() here.
Yup, I will resend the patch later.
Thanks,
Yong
>
> Thanks,
>
> tglx
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