From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> mainline inclusion from mainline-v5.7-rc1 commit 6d2c89441571ea534d6240f7724f518936c44f8d category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V CVE: NA -------------------------------- Commit bdb5ac85777d ("PCI/ERR: Handle fatal error recovery") uses reset_link() to recover from fatal errors. But during fatal error recovery, if the initial value of error status is PCI_ERS_RESULT_DISCONNECT or PCI_ERS_RESULT_NO_AER_DRIVER then even after successful recovery (using reset_link()) pcie_do_recovery() will report the recovery result as failure. Update the status of error after reset_link(). You can reproduce this issue by triggering a SW DPC using "DPC Software Trigger" bit in "DPC Control Register". You should see recovery failed dmesg log as below: pcieport 0000:00:16.0: DPC: containment event, status:0x1f27 source:0x0000 pcieport 0000:00:16.0: DPC: software trigger detected pci 0000:04:00.0: AER: can't recover (no error_detected callback) pcieport 0000:00:16.0: AER: device recovery failed Fixes: bdb5ac85777d ("PCI/ERR: Handle fatal error recovery") Link: https://lore.kernel.org/r/a255fcb3a3fdebcd90f84e08b555f1786eb8eba2.158500008... [bhelgaas: split pci_channel_io_frozen simplification to separate patch] Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Keith Busch <keith.busch@intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- drivers/pci/pcie/err.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c index 5bfc574f5519d..6d3d5b6a5c444 100644 --- a/drivers/pci/pcie/err.c +++ b/drivers/pci/pcie/err.c @@ -203,7 +203,8 @@ void pcie_do_recovery(struct pci_dev *dev, enum pci_channel_state state, pci_dbg(dev, "broadcast error_detected message\n"); if (state == pci_channel_io_frozen) { pci_walk_bus(bus, report_frozen_detected, &status); - if (reset_link(dev, service) != PCI_ERS_RESULT_RECOVERED) + status = reset_link(dev, service); + if (status != PCI_ERS_RESULT_RECOVERED) goto failed; } else { pci_walk_bus(bus, report_normal_detected, &status); -- 2.25.1