linux-kernel - Re: Bug in "genirq: record trigger type"

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Date:	Tue, 21 Oct 2008 00:22:21 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	benh@...nel.crashing.org
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"David Brownell" <dbrownell@...rs.sourceforge.net>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"linuxppc-dev list" <linuxppc-dev@...abs.org>
Subject: Re: Bug in "genirq: record trigger type"

On Mon, Oct 20, 2008 at 11:32 PM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> On Mon, 2008-10-20 at 22:05 +0000, Linux Kernel Mailing List wrote:
>> Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0c5d1eb77a8be917b638344a22afe1398236482b
>> Commit:     0c5d1eb77a8be917b638344a22afe1398236482b
>> Parent:     d6d5aeb661fc14655c417f3582ae7ec52985d2a8
>> Author:     David Brownell <dbrownell@...rs.sourceforge.net>
>> AuthorDate: Wed Oct 1 14:46:18 2008 -0700
>> Committer:  Ingo Molnar <mingo@...e.hu>
>> CommitDate: Thu Oct 2 10:24:09 2008 +0200
>
> This one is obviously broken and breaks booting on a whole bunch of
> machines (including powermac's and thus my G5, it's never good when my
> own machine breaks !).
>
> Nice to see 3 SOB's and one Ack and nobody caught the obvious bug :-)
>
>>       desc = irq_desc + irq;
>> -     if (desc->chip->set_type) {
>> -             spin_lock_irqsave(&desc->lock, flags);
>> -             ret = desc->chip->set_type(irq, type);
>> -             spin_unlock_irqrestore(&desc->lock, flags);
>> -     }
>> +     if (type == IRQ_TYPE_NONE)
>> +             return 0;
>> +
>> +     spin_lock_irqsave(&desc->lock, flags);
>> +     ret = __irq_set_trigger(desc, irq, flags);
>                                             ^^^^ type maybe ?
>
>> +     spin_unlock_irqrestore(&desc->lock, flags);
>>       return ret;
>>  }
>
> I have to run so no patch until tomorrow unless somebody beats me to it.

there is patch about it, but somehow get lost.

YH
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