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PCI/AER: Don't read upstream ports below fatal errors 

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>
This commit is contained in:
Keith Busch 2018-09-20 10:27:10 -06:00 committed by Bjorn Helgaas
parent 60271ab044
commit 9d938ea53b
1 changed files with 3 additions and 2 deletions
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5
drivers/pci/pcie/aer.c
View File

@ -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,