[PATCH] PCI/AER: Continue AER recovery of device with NO_BUS_RESET set
From: Shanker Donthineni <hidden>
Date: 2021-08-21 13:31:52
In the current implementation, the AER FATAL and NONFTAL recovery will be
terminated for the device that exhibits NO_BUS_RESET quirk. The non-zero
return value from pci_bus_error_reset() is treated as an error condition
in aer_root_reset() which leads to return PCI_ERS_RESULT_DISCONNECT.
aer_recover_work_func()
pcie_do_recovery()
report_frozen_detected()
if (aer_root_reset() == PCI_ERS_RESULT_DISCONNECT)
goto failed # termimates here because of NO_BUS_RESET
...
report_mmio_enabled()
report_resume()
pcie_clear_xxx_status()
...
return 0
failed:
pci_uevent_ers(PCI_ERS_RESULT_DISCONNECT);
The return value -ENOTTY from pci_bus_error_reset() indicates SBR was
skipped but no real errors were encountered. This scenario could be
considered as a non-error case so that the PCI device driver gets the
opportunity to recover the device back to an operational state instead
of keeping it in the DISCONNECT state.
Signed-off-by: Shanker Donthineni <redacted>
---
drivers/pci/pcie/aer.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 9784fdcf30061..8cf6bd6a3376d 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c@@ -1414,8 +1414,12 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) pci_info(dev, "not reset (no FLR support: %d)\n", rc); } else { rc = pci_bus_error_reset(dev); - pci_info(dev, "%s Port link has been reset (%d)\n", - pci_is_root_bus(dev->bus) ? "Root" : "Downstream", rc); + pci_info(dev, "%s Port link has %sbeen reset (%d)\n", + pci_is_root_bus(dev->bus) ? "Root" : "Downstream", + rc == -ENOTTY ? "not " : "", rc); + + if (rc == -ENOTTY) + rc = 0; } if ((host->native_aer || pcie_ports_native) && aer) {
--
2.25.1