diff options
Diffstat (limited to 'drivers/pci/hotplug/pciehp_pci.c')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_pci.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c index b9c1396db6fe..65e50bee1a8c 100644 --- a/drivers/pci/hotplug/pciehp_pci.c +++ b/drivers/pci/hotplug/pciehp_pci.c @@ -13,6 +13,8 @@ * */ +#define dev_fmt(fmt) "pciehp: " fmt + #include <linux/kernel.h> #include <linux/types.h> #include <linux/pci.h> @@ -61,7 +63,18 @@ int pciehp_configure_device(struct controller *ctrl) pci_assign_unassigned_bridge_resources(bridge); pcie_bus_configure_settings(parent); + + /* + * Release reset_lock during driver binding + * to avoid AB-BA deadlock with device_lock. + */ + up_read(&ctrl->reset_lock); pci_bus_add_devices(parent); + down_read_nested(&ctrl->reset_lock, ctrl->depth); + + dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); + ctrl->dsn = pci_get_dsn(dev); + pci_dev_put(dev); out: pci_unlock_rescan_remove(); @@ -102,7 +115,15 @@ void pciehp_unconfigure_device(struct controller *ctrl, bool presence) list_for_each_entry_safe_reverse(dev, temp, &parent->devices, bus_list) { pci_dev_get(dev); + + /* + * Release reset_lock during driver unbinding + * to avoid AB-BA deadlock with device_lock. + */ + up_read(&ctrl->reset_lock); pci_stop_and_remove_bus_device(dev); + down_read_nested(&ctrl->reset_lock, ctrl->depth); + /* * Ensure that no new Requests will be generated from * the device. |