linux-kernel - Re: [stable] [PATCH] x86: Reserve FIRST_DEVICE_VECTOR in used

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Date:	Fri, 10 Oct 2008 13:18:05 -0700
From:	Greg KH <greg@...ah.com>
To:	Stefan Bader <stefan.bader@...onical.com>
Cc:	stable@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [stable] [PATCH] x86: Reserve FIRST_DEVICE_VECTOR in
	used_vectors bitmap

On Fri, Oct 10, 2008 at 04:01:54PM -0400, Stefan Bader wrote:
> Affected: 2.6.24-2.6.27
> 
> Someone from the community found out, that after repeatedly unloading and
> loading a device driver that uses MSI IRQs, the system eventually assigned
> the vector initially reserved for IRQ0 to the device driver.
> 
> The reason for this is, that although IRQ0 is tied to the FIRST_DEVICE_VECTOR
> when declaring the irq_vector table, the corresponding bit in the used_vectors
> map is not set. So, if vectors are released and assigned often enough, the
> vector will get assigned to another interrupt. This happens more often with
> MSI interrupts as those are exclusively using a vector.

Is there a problem with being assigned to IRQ0 in situations like this?

thanks,

greg k-h
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