diff options
| -rw-r--r-- | drivers/crypto/ccp/sev-dev-tsm.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/crypto/ccp/sev-dev-tsm.c b/drivers/crypto/ccp/sev-dev-tsm.c index b07ae529b591..f303d8f55991 100644 --- a/drivers/crypto/ccp/sev-dev-tsm.c +++ b/drivers/crypto/ccp/sev-dev-tsm.c @@ -248,12 +248,19 @@ static void dsm_remove(struct pci_tsm *tsm) static int dsm_create(struct tio_dsm *dsm) { struct pci_dev *pdev = dsm->tsm.base_tsm.pdev; - u8 segment_id = pdev->bus ? pci_domain_nr(pdev->bus) : 0; - struct pci_dev *rootport = pcie_find_root_port(pdev); - u16 device_id = pci_dev_id(pdev); + struct pci_dev *rootport; + u8 segment_id; + u16 device_id; u16 root_port_id; u32 lnkcap = 0; + if (!pdev->bus) + return -ENODEV; + + segment_id = pci_domain_nr(pdev->bus); + rootport = pcie_find_root_port(pdev); + device_id = pci_dev_id(pdev); + if (pci_read_config_dword(rootport, pci_pcie_cap(rootport) + PCI_EXP_LNKCAP, &lnkcap)) return -ENODEV; |