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

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Message-Id: <1224570730.7654.242.camel@pasglop>
Date:	Tue, 21 Oct 2008 17:32:10 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	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: Bug in "genirq: record trigger type"

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.

Cheers,
Ben.


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