Re: [PATCH 0/2] pcie hotplug and error fixes

[Keith Busch <kbusch@kernel.org>]

On Wed, Jun 12, 2024 at 11:10:22AM -0700, Keith Busch wrote:
> From: Keith Busch <kbusch@kernel.org>
> 
> I am working with larger pcie topologies again, and we're seeing some
> failures when dealing with certain overlapping pcie events.
> 
> The topology is essentially this:
> 
>   [Root Port] <-> [UpStream Port] <-> [DownStream Port] <-> [End Device]
> 
> An error between the DSP and ED triggers DPC. There's only inband
> presence detection so it also triggers hotplug. Before the error
> handling is completed, though, another error seen by the RP triggers its
> own DPC handling.
> 
> The concurrent event handling reveals some interesting races, and this
> small patchset tries to address these in the low invasive way.
> 
> Keith Busch (2):
>   PCI: pciehp: fix concurrent sub-tree removal deadlock
>   PCI: err: ensure stable topology during handling

Oops, sorry for the noise here. I accidently pointed git send-email to
the wrong directory and resent v1 that was already flagged as breaking.
I'll resend the correct version shortly.