linux-kernel - Re: [PATCH 1/4] sparse irq: protect irq_to_desc against irq_free

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Message-ID: <alpine.LFD.2.02.1105251253070.3078@ionos>
Date:	Wed, 25 May 2011 12:54:07 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Milton Miller <miltonm@....com>
cc:	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/4] sparse irq: protect irq_to_desc against
 irq_free_descs

On Wed, 25 May 2011, Milton Miller wrote:
> On Wed, 25 May 2011 about 10:14:20 +0200 (CEST), Thomas Gleixner wrote:
> > 
> > The reason why nobody ever noticed is that the free happens in the
> > teardown path of PCI devices and at this point nothing accesses that
> > irq anymore.
> 
> I'm not talking about the irq_desc that is being removed from the
> tree, instead I'm talking about the internal elements in the
> radix tree that are used to find the pointers at the bottom of
> the tree (that in turn point to the irq_desc in the irq tree case).

Oops, did not think about that one :)

-ENOTENOUGHCOFFEE

Thanks,

	tglx
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