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Subject[PATCH AUTOSEL for 4.4 084/162] PCI: Enable ECRC only if device supports it
From: Bjorn Helgaas <>

[ Upstream commit 675734baa361cf044033bb60594dea33d8d8da36 ]

John reported that an Intel QuickAssist crypto accelerator didn't work in a
Dell PowerEdge R730. The problem seems to be that we enabled ECRC when the
device doesn't support it:

85:00.0 Co-processor [0b40]: Intel Corporation DH895XCC Series QAT [8086:0435]
Capabilities: [100 v1] Advanced Error Reporting
AERCap: First Error Pointer: 00, GenCap- CGenEn+ ChkCap- ChkEn+

1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones")
exposed the problem because it applies settings from the _HPX method to all
devices, not just hot-added ones. The R730 supplies an _HPX method that
allows the kernel to enable ECRC.

Only enable ECRC if the device advertises support for it.

Fixes: 1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones")
Reported-by: John Mazzie <>
Signed-off-by: Bjorn Helgaas <>
Signed-off-by: Sasha Levin <>
drivers/pci/probe.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 193ac13de49b..dead38f99068 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1511,6 +1511,11 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
/* Initialize Advanced Error Capabilities and Control Register */
pci_read_config_dword(dev, pos + PCI_ERR_CAP, &reg32);
reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
+ /* Don't enable ECRC generation or checking if unsupported */
+ if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
+ reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
+ if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC))
+ reg32 &= ~PCI_ERR_CAP_ECRC_CHKE;
pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);

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