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

[Oleksandr <olekstysh@xxxxxxxxx>]

On 01.08.19 17:34, Jan Beulich wrote:

Hi Jan

> On 01.08.2019 16:31, Oleksandr wrote:
> >    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.
> I'm sure this can be had without introducing a new error code.
By reusing existing one (EAGAIN comes to mind)?


> Jan
--
Regards,

Oleksandr Tyshchenko


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