[PATCH v8 5/8] PCI/AER: Allow clearing Error Status Register in FF mode

[sathyanarayanan . kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppusw...@linux.intel.com>

As per PCI firmware specification r3.2 Downstream Port Containment
Related Enhancements ECN, sec 4.5.1, table 4-6, Error Disconnect
Recover (EDR) support allows OS to handle error recovery and
clearing Error Registers even in FF mode. So remove FF mode checks in
pci_cleanup_aer_uncorrect_error_status(), pci_aer_clear_fatal_status()
and pci_cleanup_aer_error_status_regs() functions.

Signed-off-by: Kuppuswamy Sathyanarayanan 
<sathyanarayanan.kuppusw...@linux.intel.com>
Acked-by: Keith Busch <keith.bu...@intel.com>
---
 drivers/pci/pcie/aer.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index b45bc47d04fe..e1509bb900c5 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -383,9 +383,6 @@ 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);
@@ -406,9 +403,6 @@ 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);
@@ -430,9 +424,6 @@ 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);
@@ -455,7 +446,8 @@ void pci_aer_init(struct pci_dev *dev)
        if (dev->aer_cap)
                dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL);
 
-       pci_cleanup_aer_error_status_regs(dev);
+       if (!pcie_aer_get_firmware_first(dev))
+               pci_cleanup_aer_error_status_regs(dev);
 }
 
 void pci_aer_exit(struct pci_dev *dev)
-- 
2.21.0