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

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Date:   Sat,  9 Nov 2019 21:38:22 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Keith Busch <keith.busch@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sinan Kaya <okaya@...nel.org>, Sasha Levin <sashal@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 080/191] PCI/AER: Don't read upstream ports below fatal errors

From: Keith Busch <keith.busch@...el.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@...el.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Sinan Kaya <okaya@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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