Re: [Xen-devel] [Question] Proper location for Linux error code (-EPROBE_DEFER) in Xen

[Oleksandr <olekstysh@xxxxxxxxx>]

On 01.08.19 17:31, Oleksandr wrote:
> > Hello,
> Hi, Roger
>
>
> > I think it would help if you describe why such error code is needed by
> > Xen and how it would be used.
>  This is needed for the upcoming V2 of the IPMMU driver (ARM) [1] 
> which may request
>  deferred probing (returns -EPROBE_DEFER) depending on what device 
> will be probed the first
>  (Root device must be registered before Cache devices. If not the case,
>  driver will deny further Cache device probes until Root device is 
> registered).
> As we can't guarantee a fixed pre-defined order for the device nodes 
> in DT, we need to be ready for the situation where devices being probed
> in "any" order. So, framework (drivers/passthrough/arm/iommu.c) will 
> be modified a bit to be able to handle -EPROBE_DEFER returning by driver.
> [1] 
> https://lists.xenproject.org/archives/html/xen-devel/2017-07/msg02679.html
Sorry, I provided wrong link.

The correct link should be:

https://patchew.org/Xen/1561545009-17493-2-git-send-email-olekstysh@xxxxxxxxx/



>
--
Regards,

Oleksandr Tyshchenko


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