linux-kernel - Re: iommu breaks usb after resume

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Message-ID: <20080321132745.GK27245@elte.hu>
Date:	Fri, 21 Mar 2008 14:27:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@....cz>
Cc:	Andi Kleen <andi@...stfloor.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>
Subject: Re: iommu breaks usb after resume


* Pavel Machek <pavel@....cz> wrote:

> Hi!
> 
> On 64-bit machine with 4GB ram (8core from amd), iommu breaks USB
> after swsusp. iommu=soft fixes that issue.
> 
> I guess iommu handling in arch/x86/kernel/ should have some
> suspend/resume support, as it manipulates hardware registers...?

agreed ...

	Ingo
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