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Subject[PATCH 1/5] PCI/DPC: Ignore devices with no AER Capability
Date
From: Bjorn Helgaas <bhelgaas@google.com>

Downstream Ports may support DPC regardless of whether they support AER
(see PCIe r5.0, sec 6.2.10.2). Previously, if the user booted with
"pcie_ports=dpc-native", it was possible for dpc_probe() to succeed even if
the device had no AER Capability, but dpc_get_aer_uncorrect_severity()
depends on the AER Capability.

dpc_probe() previously failed if:

!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native
!(pcie_aer_is_native() || pcie_ports_dpc_native) # by De Morgan's law

so it succeeded if:

pcie_aer_is_native() || pcie_ports_dpc_native

Fail dpc_probe() if the device has no AER Capability.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Olof Johansson <olof@lixom.net>
---
drivers/pci/pcie/dpc.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index e05aba86a317..ed0dbc43d018 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -287,6 +287,9 @@ static int dpc_probe(struct pcie_device *dev)
int status;
u16 ctl, cap;

+ if (!pdev->aer_cap)
+ return -ENOTSUPP;
+
if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native)
return -ENOTSUPP;

--
2.25.1
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