Re: [PATCH] arm/xen: Don't probe xenbus as part of an early initcall

[Stefano Stabellini]

On Wed, 10 Feb 2021, Woodhouse, David wrote:
> On Wed, 2021-02-10 at 17:06 +0000, Julien Grall wrote:
> > From: Julien Grall <jgrall@xxxxxxxxxx>
> > 
> > After Commit 3499ba8198cad ("xen: Fix event channel callback via
> > INTX/GSI"), xenbus_probe() will be called too early on Arm. This will
> > recent to a guest hang during boot.
> > 
> > If there hang wasn't there, we would have ended up to call
> > xenbus_probe() twice (the second time is in xenbus_probe_initcall()).
> > 
> > We don't need to initialize xenbus_probe() early for Arm guest.
> > Therefore, the call in xen_guest_init() is now removed.
> > 
> > After this change, there is no more external caller for xenbus_probe().
> > So the function is turned to a static one. Interestingly there were two
> > prototypes for it.
> > 
> > Fixes: 3499ba8198cad ("xen: Fix event channel callback via INTX/GSI")
> > Reported-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
> > Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> 
> Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>