[PATCH AUTOSEL 4.19 080/191] PCI/AER: Don't read upstream ports below fatal errors

Sasha Levin
2019-11-10T03:13:23Z

From: Keith Busch <keith.busch@intel.com>

[ Upstream commit 9d938ea53b265ed6df6cdd1715d971f0235fdbfc ]

The AER driver has never read the config space of an endpoint that reported
a fatal error because the link to that device is considered unreliable.

An ERR_FATAL from an upstream port almost certainly indicates an error on
its upstream link, so we can't expect to reliably read its config space for
the same reason.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/pcie/aer.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index ffbbd759683c5..5c3ea7254c6ae 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1116,8 +1116,9 @@ int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
&info->mask);
if (!(info->status & ~info->mask))
return 0;
- } else if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
- info->severity == AER_NONFATAL) {
+ } else if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
+ pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
+ info->severity == AER_NONFATAL) {

/* Link is still healthy for IO reads */
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
--
2.20.1