pci: intel: Fix error when enumerating multi-function PCIe device

Hardware return completion status non-zero when read from non exist
function in multi-function PCIe device. Return error will cause PCIe
enumeration fail.

Change it to return 0 and return value 0xffffffff when error.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>

diff --git a/drivers/pci/pcie_intel_fpga.c b/drivers/pci/pcie_intel_fpga.c
index e74b35ac1638e61f45cd709b46aa116373f8dee9..a096d1c697bb657ad87fa5723e8fbca1e158fb6a 100644 (file)
--- a/drivers/pci/pcie_intel_fpga.c
+++ b/drivers/pci/pcie_intel_fpga.c
@@ -161,8 +161,10 @@ static int tlp_read_packet(struct intel_fpga_pcie *pcie, u32 *value)
                        dw[count++] = cra_readl(pcie, RP_RXCPL_REG);
                        if (ctrl & RP_RXCPL_EOP) {
                                comp_status = TLP_COMP_STATUS(dw[1]);
-                               if (comp_status)
-                                       return -EFAULT;
+                               if (comp_status) {
+                                       *value = pci_get_ff(PCI_SIZE_32);
+                                       return 0;
+                               }
 
                                if (value &&
                                    TLP_BYTE_COUNT(dw[1]) == sizeof(u32) &&