mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
PCI/AER: Don't clear AER bits if error handling is Firmware-First
If the platform requests Firmware-First error handling, firmware is responsible for reading and clearing AER status bits. If OSPM also clears them, we may miss errors. See ACPI v6.2, sec 18.3.2.5 and 18.4. This race is mostly of theoretical significance, as it is not easy to reasonably demonstrate it in testing. Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> [bhelgaas: add similar guards to pci_cleanup_aer_uncorrect_error_status() and pci_aer_clear_fatal_status()] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
parent
944d58595b
commit
45687f96c1
1 changed files with 9 additions and 0 deletions
|
@ -397,6 +397,9 @@ int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
|
|||
if (!pos)
|
||||
return -EIO;
|
||||
|
||||
if (pcie_aer_get_firmware_first(dev))
|
||||
return -EIO;
|
||||
|
||||
/* Clear status bits for ERR_NONFATAL errors only */
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev);
|
||||
|
@ -417,6 +420,9 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev)
|
|||
if (!pos)
|
||||
return;
|
||||
|
||||
if (pcie_aer_get_firmware_first(dev))
|
||||
return;
|
||||
|
||||
/* Clear status bits for ERR_FATAL errors only */
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev);
|
||||
|
@ -438,6 +444,9 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
|
|||
if (!pos)
|
||||
return -EIO;
|
||||
|
||||
if (pcie_aer_get_firmware_first(dev))
|
||||
return -EIO;
|
||||
|
||||
port_type = pci_pcie_type(dev);
|
||||
if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
|
||||
pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
|
||||
|
|
Loading…
Reference in a new issue