6.6-stable review patch. If anyone has any objections, please let me know.
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From: Lukas Wunner lukas@wunner.de
commit 1cbc5e25fb70e942a7a735a1f3d6dd391afc9b29 upstream.
Upon failure to recover from a PCIe error through AER, DPC or EDR, a uevent is sent to inform user space about disconnection of the bridge whose subordinate devices failed to recover.
However the bridge itself is not disconnected. Instead, a uevent should be sent for each of the subordinate devices.
Only if the "bridge" happens to be a Root Complex Event Collector or Integrated Endpoint does it make sense to send a uevent for it (because there are no subordinate devices).
Right now if there is a mix of subordinate devices with and without pci_error_handlers, a BEGIN_RECOVERY event is sent for those with pci_error_handlers but no FAILED_RECOVERY event is ever sent for them afterwards. Fix it.
Fixes: 856e1eb9bdd4 ("PCI/AER: Add uevents in AER and EEH error/resume") Signed-off-by: Lukas Wunner lukas@wunner.de Signed-off-by: Bjorn Helgaas bhelgaas@google.com Cc: stable@vger.kernel.org # v4.16+ Link: https://patch.msgid.link/68fc527a380821b5d861dd554d2ce42cb739591c.1755008151... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/pcie/err.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/pci/pcie/err.c +++ b/drivers/pci/pcie/err.c @@ -108,6 +108,12 @@ static int report_normal_detected(struct return report_error_detected(dev, pci_channel_io_normal, data); }
+static int report_perm_failure_detected(struct pci_dev *dev, void *data) +{ + pci_uevent_ers(dev, PCI_ERS_RESULT_DISCONNECT); + return 0; +} + static int report_mmio_enabled(struct pci_dev *dev, void *data) { struct pci_driver *pdrv; @@ -275,7 +281,7 @@ pci_ers_result_t pcie_do_recovery(struct failed: pci_walk_bridge(bridge, pci_pm_runtime_put, NULL);
- pci_uevent_ers(bridge, PCI_ERS_RESULT_DISCONNECT); + pci_walk_bridge(bridge, report_perm_failure_detected, NULL);
/* TODO: Should kernel panic here? */ pci_info(bridge, "device recovery failed\n");