linux-kernel - Re: [PATCH] irq/irqdomain: change bail out condition for irq_domain

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Date:	Tue, 20 Sep 2011 23:41:02 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
cc:	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH] irq/irqdomain: change bail out condition for
 irq_domain_add()

On Tue, 20 Sep 2011, Sebastian Andrzej Siewior wrote:

> I tried to convert x86 to this infrastructure and I run into
> |BUG: unable to handle kernel NULL pointer dereference at 00000014
> 
> (d || d->domain) is kinda bogus because if d is NULL it will check for
> d->domain which should fail. It seems that the code needs the irq_data
> to be present and there should be no irq_domain set yet. This patch does
> this.
> 
> My convert to this infrastructure still does not work with this patch
> but I have enough for today.
> 
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  kernel/irq/irqdomain.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index d5828da..213089b 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -29,7 +29,7 @@ void irq_domain_add(struct irq_domain *domain)
>  	 */
>  	for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
>  		d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
> -		if (d || d->domain) {
> +		if (!d || d->domain) {
>  			/* things are broken; just report, don't clean up */
>  			WARN(1, "error: irq_desc already assigned to a domain");
>  			return;

I've already queued a similar fix in tip/irq/urgent

Thanks,

	tglx
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