[PATCH] PCI: Allow PCI express root ports to find themselves

Thierry Reding [off-list ref] writes:

From: Thierry Reding <redacted>

If the pci_find_pcie_root_port() function is called on a root port
itself, return the root port rather than NULL.

This effectively reverts commit 0e405232871d6 ("PCI: fix oops when
try to find Root Port for a PCI device") which added an extra check
that would now be redundant.

Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported")
Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum")
Signed-off-by: Thierry Reding <redacted>
---
This applies on top of and was tested on next-20170817.

Michael, it'd be great if you could test this one again to clarify
whether or not the fix that's already in Linus' tree is still needed, or
whether it's indeed obsoleted by this patch.

This works fine for me, applied on top of Linus' tree (d33a2a914319).

cheers