Commit 30fc24b5 authored by Kenji Kaneshige's avatar Kenji Kaneshige Committed by Jesse Barnes

PCI: Prevent AER driver from being loaded on non-root port PCIE devices

A bug was seen on boards using a PLX 8518 switch device which advertises
AER on each of it's transparent bridges. The AER driver was loaded for
each bridge and this driver tried to access the AER source ID register
whenever an interrupt occured on the shared PCI INTX lines. The source
ID register does not exist on non root port PCIE device's  which
advertise AER and trying to access this register causes a unsupported
request error on the bridge. Thus, when the next interrupt occurs,
another error is found and the non existent source ID register is
accessed again, and so it goes on.

The result is a spammed dmesg with unsupported request PCI express
errors on the bridge device that the AER driver is loaded against.
Reported-by: default avatarMalcolm Crossley <malcolm.crossley2@gefanuc.com>
Signed-off-by: default avatarKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Tested-by: default avatarMalcolm Crossley <malcolm.crossley2@gefanuc.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 308cf8e1
......@@ -52,7 +52,7 @@ static struct pci_error_handlers aer_error_handlers = {
static struct pcie_port_service_driver aerdriver = {
.name = "aer",
.port_type = PCIE_ANY_PORT,
.port_type = PCIE_RC_PORT,
.service = PCIE_PORT_SERVICE_AER,
.probe = aer_probe,
......
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