diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index af0cc3456dc1..da5570cf5c6a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -522,10 +522,11 @@ struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) bridge = pci_upstream_bridge(bridge); } - if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) - return NULL; + if (highest_pcie_bridge && + pci_pcie_type(highest_pcie_bridge) == PCI_EXP_TYPE_ROOT_PORT) + return highest_pcie_bridge; - return highest_pcie_bridge; + return NULL; } EXPORT_SYMBOL(pci_find_pcie_root_port); @@ -4260,6 +4261,41 @@ int pci_reset_function(struct pci_dev *dev) EXPORT_SYMBOL_GPL(pci_reset_function); /** + * pci_reset_function_locked - quiesce and reset a PCI device function + * @dev: PCI device to reset + * + * Some devices allow an individual function to be reset without affecting + * other functions in the same device. The PCI device must be responsive + * to PCI config space in order to use this function. + * + * This function does not just reset the PCI portion of a device, but + * clears all the state associated with the device. This function differs + * from __pci_reset_function() in that it saves and restores device state + * over the reset. It also differs from pci_reset_function() in that it + * requires the PCI device lock to be held. + * + * Returns 0 if the device function was successfully reset or negative if the + * device doesn't support resetting a single function. + */ +int pci_reset_function_locked(struct pci_dev *dev) +{ + int rc; + + rc = pci_probe_reset_function(dev); + if (rc) + return rc; + + pci_dev_save_and_disable(dev); + + rc = __pci_reset_function_locked(dev); + + pci_dev_restore(dev); + + return rc; +} +EXPORT_SYMBOL_GPL(pci_reset_function_locked); + +/** * pci_try_reset_function - quiesce and reset a PCI device function * @dev: PCI device to reset * |