diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b2879a6be5f8..d80e52421bf0 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1246,9 +1246,11 @@ static int pci_dev_wait(struct pci_dev *dev, char *reset_type, int timeout) * initialize. * * If the device is below a Root Port with Configuration RRS - * Software Visibility enabled, reading the Vendor ID returns a + * Software Visibility enabled, reading the Vendor ID may return a * special data value if the device responded with RRS. Read the - * Vendor ID until we get non-RRS status. + * Vendor ID until we get non-RRS status and something other than + * ~0. The Vendor ID of VFs reads ~0, so check their Command + * register instead. * * If there's no Root Port or Configuration RRS Software Visibility * is not enabled, the device may still respond with RRS, but @@ -1268,8 +1270,13 @@ static int pci_dev_wait(struct pci_dev *dev, char *reset_type, int timeout) if (root && root->config_rrs_sv) { pci_read_config_dword(dev, PCI_VENDOR_ID, &id); - if (!pci_bus_rrs_vendor_id(id)) - break; + if (!pci_bus_rrs_vendor_id(id)) { + if (PCI_POSSIBLE_ERROR(id) && dev->is_virtfn) + pci_read_config_dword(dev, PCI_COMMAND, + &id); + if (!PCI_POSSIBLE_ERROR(id)) + break; + } } else { pci_read_config_dword(dev, PCI_COMMAND, &id); if (!PCI_POSSIBLE_ERROR(id))