Re: ehci-pci : WARNING: CPU: 0 PID: 347 at kernel/dma/direct.c:34

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To: John Donnelly <john.p.donnelly@xxxxxxxxxx>
Subject: Re: ehci-pci : WARNING: CPU: 0 PID: 347 at kernel/dma/direct.c:34
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 28 Mar 2020 11:34:59 -0400 (EDT)
Cc: linux-usb@xxxxxxxxxxxxxxx
In-reply-to: <F5A0CCCB-4503-40B1-A24D-323F5B89C1F4@oracle.com>

On Fri, 27 Mar 2020, John Donnelly wrote:

> Hi,
> 
> I am seeing this WARNING event with iommu=off when booting a DL380
> server with a 5.4.17 kernel.

> Has anyone seen this before ?

I suspect that the vast majority of users do not turn off their iommu.

Alan Stern

References:
- ehci-pci : WARNING: CPU: 0 PID: 347 at kernel/dma/direct.c:34
  - From: John Donnelly

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