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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Keith Busch <keith.busch@intel.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Sinan Kaya <okaya@kernel.org>, Sasha Levin <sashal@kernel.org>,
	linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 080/191] PCI/AER: Don't read upstream ports below fatal errors
Date: Sat,  9 Nov 2019 21:38:22 -0500
Message-ID: <20191110024013.29782-80-sashal@kernel.org> (raw)
In-Reply-To: <20191110024013.29782-1-sashal@kernel.org>

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


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191110024013.29782-1-sashal@kernel.org>
2019-11-10  2:37 ` [PATCH AUTOSEL 4.19 006/191] PCI/ACPI: Correct error message for ASPM disabling Sasha Levin
2019-11-10  2:37 ` [PATCH AUTOSEL 4.19 008/191] PCI: mediatek: Fix unchecked return value Sasha Levin
2019-11-10  2:38 ` [PATCH AUTOSEL 4.19 061/191] PCI: portdrv: Initialize service drivers directly Sasha Levin
2019-11-10  2:38 ` [PATCH AUTOSEL 4.19 079/191] PCI/AER: Take reference on error devices Sasha Levin
2019-11-10  2:38 ` Sasha Levin [this message]
2019-11-10  2:38 ` [PATCH AUTOSEL 4.19 081/191] PCI/ERR: Use slot reset if available Sasha Levin
2019-11-10  2:39 ` [PATCH AUTOSEL 4.19 145/191] PCI/ERR: Run error recovery callbacks for all affected devices Sasha Levin

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