diff options
25 files changed, 209 insertions, 44 deletions
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c index 36bed5a12750..c17f90d0f73c 100644 --- a/arch/powerpc/kernel/eeh_driver.c +++ b/arch/powerpc/kernel/eeh_driver.c @@ -369,7 +369,9 @@ static void *eeh_rmv_device(void *data, void *userdata) edev->mode |= EEH_DEV_DISCONNECTED; (*removed)++; + pci_lock_rescan_remove(); pci_stop_and_remove_bus_device(dev); + pci_unlock_rescan_remove(); return NULL; } @@ -416,10 +418,13 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus) * into pcibios_add_pci_devices(). */ eeh_pe_state_mark(pe, EEH_PE_KEEP); - if (bus) + if (bus) { + pci_lock_rescan_remove(); pcibios_remove_pci_devices(bus); - else if (frozen_bus) + pci_unlock_rescan_remove(); + } else if (frozen_bus) { eeh_pe_dev_traverse(pe, eeh_rmv_device, &removed); + } /* Reset the pci controller. (Asserts RST#; resets config space). * Reconfigure bridges and devices. Don't try to bring the system @@ -429,6 +434,8 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus) if (rc) return rc; + pci_lock_rescan_remove(); + /* Restore PE */ eeh_ops->configure_bridge(pe); eeh_pe_restore_bars(pe); @@ -462,6 +469,7 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus) pe->tstamp = tstamp; pe->freeze_count = cnt; + pci_unlock_rescan_remove(); return 0; } @@ -618,8 +626,11 @@ perm_error: eeh_pe_dev_traverse(pe, eeh_report_failure, NULL); /* Shut down the device drivers for good. */ - if (frozen_bus) + if (frozen_bus) { + pci_lock_rescan_remove(); pcibios_remove_pci_devices(frozen_bus); + pci_unlock_rescan_remove(); + } } static void eeh_handle_special_event(void) @@ -692,6 +703,7 @@ static void eeh_handle_special_event(void) if (rc == 2 || rc == 1) eeh_handle_normal_event(pe); else { + pci_lock_rescan_remove(); list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { phb_pe = eeh_phb_pe_get(hose); @@ -703,6 +715,7 @@ static void eeh_handle_special_event(void) eeh_pe_dev_traverse(pe, eeh_report_failure, NULL); pcibios_remove_pci_devices(bus); } + pci_unlock_rescan_remove(); } } diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 0703bff5e60e..07ee02aa3c51 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -596,7 +596,9 @@ static int acpi_pci_root_add(struct acpi_device *device, pci_assign_unassigned_root_bus_resources(root->bus); } + pci_lock_rescan_remove(); pci_bus_add_devices(root->bus); + pci_unlock_rescan_remove(); return 1; end: @@ -608,6 +610,8 @@ static void acpi_pci_root_remove(struct acpi_device *device) { struct acpi_pci_root *root = acpi_driver_data(device); + pci_lock_rescan_remove(); + pci_stop_root_bus(root->bus); device_set_run_wake(root->bus->bridge, false); @@ -615,6 +619,8 @@ static void acpi_pci_root_remove(struct acpi_device *device) pci_remove_root_bus(root->bus); + pci_unlock_rescan_remove(); + kfree(root); } diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c index 767ff4d839f4..570b18a113ff 100644 --- a/drivers/message/fusion/mptbase.c +++ b/drivers/message/fusion/mptbase.c @@ -346,7 +346,7 @@ static int mpt_remove_dead_ioc_func(void *arg) if ((pdev == NULL)) return -1; - pci_stop_and_remove_bus_device(pdev); + pci_stop_and_remove_bus_device_locked(pdev); return 0; } diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h index 1592dbe4f904..b6162be4df40 100644 --- a/drivers/pci/hotplug/acpiphp.h +++ b/drivers/pci/hotplug/acpiphp.h @@ -77,6 +77,8 @@ struct acpiphp_bridge { /* PCI-to-PCI bridge device */ struct pci_dev *pci_dev; + + bool is_going_away; }; @@ -150,6 +152,7 @@ struct acpiphp_attention_info /* slot flags */ #define SLOT_ENABLED (0x00000001) +#define SLOT_IS_GOING_AWAY (0x00000002) /* function flags */ @@ -169,7 +172,7 @@ void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot); typedef int (*acpiphp_callback)(struct acpiphp_slot *slot, void *data); int acpiphp_enable_slot(struct acpiphp_slot *slot); -int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); +int acpiphp_disable_slot(struct acpiphp_slot *slot); u8 acpiphp_get_power_status(struct acpiphp_slot *slot); u8 acpiphp_get_attention_status(struct acpiphp_slot *slot); u8 acpiphp_get_latch_status(struct acpiphp_slot *slot); diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c index dca66bc44578..728c31f4c2c5 100644 --- a/drivers/pci/hotplug/acpiphp_core.c +++ b/drivers/pci/hotplug/acpiphp_core.c @@ -156,7 +156,7 @@ static int disable_slot(struct hotplug_slot *hotplug_slot) pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); /* disable the specified slot */ - return acpiphp_disable_and_eject_slot(slot->acpi_slot); + return acpiphp_disable_slot(slot->acpi_slot); } diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 1cf605f67673..641ba6761bd7 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -430,6 +430,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) pr_err("failed to remove notify handler\n"); } } + slot->flags |= SLOT_IS_GOING_AWAY; if (slot->slot) acpiphp_unregister_hotplug_slot(slot); } @@ -437,6 +438,8 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) mutex_lock(&bridge_mutex); list_del(&bridge->list); mutex_unlock(&bridge_mutex); + + bridge->is_going_away = true; } /** @@ -736,6 +739,10 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; + /* Bail out if the bridge is going away. */ + if (bridge->is_going_away) + return; + list_for_each_entry(slot, &bridge->slots, node) { struct pci_bus *bus = slot->bus; struct pci_dev *dev, *tmp; @@ -805,6 +812,8 @@ void acpiphp_check_host_bridge(acpi_handle handle) } } +static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); + static void hotplug_event(acpi_handle handle, u32 type, void *data) { struct acpiphp_context *context = data; @@ -834,6 +843,9 @@ static void hotplug_event(acpi_handle handle, u32 type, void *data) } else { struct acpiphp_slot *slot = func->slot; + if (slot->flags & SLOT_IS_GOING_AWAY) + break; + mutex_lock(&slot->crit_sect); enable_slot(slot); mutex_unlock(&slot->crit_sect); @@ -849,6 +861,9 @@ static void hotplug_event(acpi_handle handle, u32 type, void *data) struct acpiphp_slot *slot = func->slot; int ret; + if (slot->flags & SLOT_IS_GOING_AWAY) + break; + /* * Check if anything has changed in the slot and rescan * from the parent if that's the case. @@ -878,9 +893,11 @@ static void hotplug_event_work(void *data, u32 type) acpi_handle handle = context->handle; acpi_scan_lock_acquire(); + pci_lock_rescan_remove(); hotplug_event(handle, type, context); + pci_unlock_rescan_remove(); acpi_scan_lock_release(); acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL); put_bridge(context->func.parent); @@ -1048,12 +1065,19 @@ void acpiphp_remove_slots(struct pci_bus *bus) */ int acpiphp_enable_slot(struct acpiphp_slot *slot) { + pci_lock_rescan_remove(); + + if (slot->flags & SLOT_IS_GOING_AWAY) + return -ENODEV; + mutex_lock(&slot->crit_sect); /* configure all functions */ if (!(slot->flags & SLOT_ENABLED)) enable_slot(slot); mutex_unlock(&slot->crit_sect); + + pci_unlock_rescan_remove(); return 0; } @@ -1061,10 +1085,12 @@ int acpiphp_enable_slot(struct acpiphp_slot *slot) * acpiphp_disable_and_eject_slot - power off and eject slot * @slot: ACPI PHP slot */ -int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) +static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) { struct acpiphp_func *func; - int retval = 0; + + if (slot->flags & SLOT_IS_GOING_AWAY) + return -ENODEV; mutex_lock(&slot->crit_sect); @@ -1082,9 +1108,18 @@ int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) } mutex_unlock(&slot->crit_sect); - return retval; + return 0; } +int acpiphp_disable_slot(struct acpiphp_slot *slot) +{ + int ret; + + pci_lock_rescan_remove(); + ret = acpiphp_disable_and_eject_slot(slot); + pci_unlock_rescan_remove(); + return ret; +} /* * slot enabled: 1 @@ -1095,7 +1130,6 @@ u8 acpiphp_get_power_status(struct acpiphp_slot *slot) return (slot->flags & SLOT_ENABLED); } - /* * latch open: 1 * latch closed: 0 @@ -1105,7 +1139,6 @@ u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); } - /* * adapter presence : 1 * absence : 0 diff --git a/drivers/pci/hotplug/cpci_hotplug_pci.c b/drivers/pci/hotplug/cpci_hotplug_pci.c index d3add9819f63..8c1464851768 100644 --- a/drivers/pci/hotplug/cpci_hotplug_pci.c +++ b/drivers/pci/hotplug/cpci_hotplug_pci.c @@ -254,9 +254,12 @@ int __ref cpci_configure_slot(struct slot *slot) { struct pci_dev *dev; struct pci_bus *parent; + int ret = 0; dbg("%s - enter", __func__); + pci_lock_rescan_remove(); + if (slot->dev == NULL) { dbg("pci_dev null, finding %02x:%02x:%x", slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn)); @@ -277,7 +280,8 @@ int __ref cpci_configure_slot(struct slot *slot) slot->dev = pci_get_slot(slot->bus, slot->devfn); if (slot->dev == NULL) { err("Could not find PCI device for slot %02x", slot->number); - return -ENODEV; + ret = -ENODEV; + goto out; } } parent = slot->dev->bus; @@ -294,8 +298,10 @@ int __ref cpci_configure_slot(struct slot *slot) pci_bus_add_devices(parent); + out: + pci_unlock_rescan_remove(); dbg("%s - exit", __func__); - return 0; + return ret; } int cpci_unconfigure_slot(struct slot* slot) @@ -308,6 +314,8 @@ int cpci_unconfigure_slot(struct slot* slot) return -ENODEV; } + pci_lock_rescan_remove(); + list_for_each_entry_safe(dev, temp, &slot->bus->devices, bus_list) { if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn)) continue; @@ -318,6 +326,8 @@ int cpci_unconfigure_slot(struct slot* slot) pci_dev_put(slot->dev); slot->dev = NULL; + pci_unlock_rescan_remove(); + dbg("%s - exit", __func__); return 0; } diff --git a/drivers/pci/hotplug/cpqphp_pci.c b/drivers/pci/hotplug/cpqphp_pci.c index 6e4a12c91adb..a3e3c2002b58 100644 --- a/drivers/pci/hotplug/cpqphp_pci.c +++ b/drivers/pci/hotplug/cpqphp_pci.c @@ -86,6 +86,8 @@ int cpqhp_configure_device (struct controller* ctrl, struct pci_func* func) struct pci_bus *child; int num; + pci_lock_rescan_remove(); + if (func->pci_dev == NULL) func->pci_dev = pci_get_bus_and_slot(func->bus,PCI_DEVFN(func->device, func->function)); @@ -100,7 +102,7 @@ int cpqhp_configure_device (struct controller* ctrl, struct pci_func* func) func->pci_dev = pci_get_bus_and_slot(func->bus, PCI_DEVFN(func->device, func->function)); if (func->pci_dev == NULL) { dbg("ERROR: pci_dev still null\n"); - return 0; + goto out; } } @@ -113,6 +115,8 @@ int cpqhp_configure_device (struct controller* ctrl, struct pci_func* func) pci_dev_put(func->pci_dev); + out: + pci_unlock_rescan_remove(); return 0; } @@ -123,6 +127,7 @@ int cpqhp_unconfigure_device(struct pci_func* func) dbg("%s: bus/dev/func = %x/%x/%x\n", __func__, func->bus, func->device, func->function); + pci_lock_rescan_remove(); for (j=0; j<8 ; j++) { struct pci_dev* temp = pci_get_bus_and_slot(func->bus, PCI_DEVFN(func->device, j)); if (temp) { @@ -130,6 +135,7 @@ int cpqhp_unconfigure_device(struct pci_func* func) pci_stop_and_remove_bus_device(temp); } } + pci_unlock_rescan_remove(); return 0; } diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c index efdc13adbe41..cf3ac1e4b099 100644 --- a/drivers/pci/hotplug/ibmphp_core.c +++ b/drivers/pci/hotplug/ibmphp_core.c @@ -718,6 +718,8 @@ static void ibm_unconfigure_device(struct pci_func *func) func->device, func->function); debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0); + pci_lock_rescan_remove(); + for (j = 0; j < 0x08; j++) { temp = pci_get_bus_and_slot(func->busno, (func->device << 3) | j); if (temp) { @@ -725,7 +727,10 @@ static void ibm_unconfigure_device(struct pci_func *func) pci_dev_put(temp); } } + pci_dev_put(func->dev); + + pci_unlock_rescan_remove(); } /* @@ -780,6 +785,8 @@ static int ibm_configure_device(struct pci_func *func) int flag = 0; /* this is to make sure we don't double scan the bus, for bridged devices primarily */ + pci_lock_rescan_remove(); + if (!(bus_structure_fixup(func->busno))) flag = 1; if (func->dev == NULL) @@ -789,7 +796,7 @@ static int ibm_configure_device(struct pci_func *func) if (func->dev == NULL) { struct pci_bus *bus = pci_find_bus(0, func->busno); if (!bus) - return 0; + goto out; num = pci_scan_slot(bus, PCI_DEVFN(func->device, func->function)); @@ -800,7 +807,7 @@ static int ibm_configure_device(struct pci_func *func) PCI_DEVFN(func->device, func->function)); if (func->dev == NULL) { err("ERROR... : pci_dev still NULL\n"); - return 0; + goto out; } } if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) { @@ -810,6 +817,8 @@ static int ibm_configure_device(struct pci_func *func) pci_bus_add_devices(child); } + out: + pci_unlock_rescan_remove(); return 0; } diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c index 198355112ee7..b07d7cc2d697 100644 --- a/drivers/pci/hotplug/pciehp_pci.c +++ b/drivers/pci/hotplug/pciehp_pci.c @@ -39,22 +39,26 @@ int pciehp_configure_device(struct slot *p_slot) struct pci_dev *dev; struct pci_dev *bridge = p_slot->ctrl->pcie->port; struct pci_bus *parent = bridge->subordinate; - int num; + int num, ret = 0; struct controller *ctrl = p_slot->ctrl; + pci_lock_rescan_remove(); + dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); if (dev) { ctrl_err(ctrl, "Device %s already exists " "at %04x:%02x:00, cannot hot-add\n", pci_name(dev), pci_domain_nr(parent), parent->number); pci_dev_put(dev); - return -EINVAL; + ret = -EINVAL; + goto out; } num = pci_scan_slot(parent, PCI_DEVFN(0, 0)); if (num == 0) { ctrl_err(ctrl, "No new device found\n"); - return -ENODEV; + ret = -ENODEV; + goto out; } list_for_each_entry(dev, &parent->devices, bus_list) @@ -73,7 +77,9 @@ int pciehp_configure_device(struct slot *p_slot) pci_bus_add_devices(parent); - return 0; + out: + pci_unlock_rescan_remove(); + return ret; } int pciehp_unconfigure_device(struct slot *p_slot) @@ -90,6 +96,8 @@ int pciehp_unconfigure_device(struct slot *p_slot) __func__, pci_domain_nr(parent), parent->number); pciehp_get_adapter_status(p_slot, &presence); + pci_lock_rescan_remove(); + /* * Stopping an SR-IOV PF device removes all the associated VFs, * which will update the bus->devices list and confuse the @@ -124,5 +132,6 @@ int pciehp_unconfigure_device(struct slot *p_slot) pci_dev_put(dev); } + pci_unlock_rescan_remove(); return rc; } diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c index e9c044d15add..4fcdeedda31b 100644 --- a/drivers/pci/hotplug/rpadlpar_core.c +++ b/drivers/pci/hotplug/rpadlpar_core.c @@ -354,10 +354,15 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) { struct pci_bus *bus; struct slot *slot; + int ret = 0; + + pci_lock_rescan_remove(); bus = pcibios_find_pci_bus(dn); - if (!bus) - return -EINVAL; + if (!bus) { + ret = -EINVAL; + goto out; + } pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", bus->self ? pci_name(bus->self) : "<!PHB!>"); @@ -371,7 +376,8 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", __func__, drc_name); - return -EIO; + ret = -EIO; + goto out; } } @@ -382,7 +388,8 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) if (pcibios_unmap_io_space(bus)) { printk(KERN_ERR "%s: failed to unmap bus range\n", __func__); - return -ERANGE; + ret = -ERANGE; + goto out; } /* Remove the EADS bridge device itself */ @@ -390,7 +397,9 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); pci_stop_and_remove_bus_device(bus->self); - return 0; + out: + pci_unlock_rescan_remove(); + return ret; } /** diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c index b7fc5c9255a5..4796c15fba94 100644 --- a/drivers/pci/hotplug/rpaphp_core.c +++ b/drivers/pci/hotplug/rpaphp_core.c @@ -398,7 +398,9 @@ static int enable_slot(struct hotplug_slot *hotplug_slot) return retval; if (state == PRESENT) { + pci_lock_rescan_remove(); pcibios_add_pci_devices(slot->bus); + pci_unlock_rescan_remove(); slot->state = CONFIGURED; } else if (state == EMPTY) { slot->state = EMPTY; @@ -418,7 +420,9 @@ static int disable_slot(struct hotplug_slot *hotplug_slot) if (slot->state == NOT_CONFIGURED) return -EINVAL; + pci_lock_rescan_remove(); pcibios_remove_pci_devices(slot->bus); + pci_unlock_rescan_remove(); vm_unmap_aliases(); slot->state = NOT_CONFIGURED; diff --git a/drivers/pci/hotplug/s390_pci_hpc.c b/drivers/pci/hotplug/s390_pci_hpc.c index 3c7eb5dd91c6..8d2ce22151eb 100644 --- a/drivers/pci/hotplug/s390_pci_hpc.c +++ b/drivers/pci/hotplug/s390_pci_hpc.c @@ -80,7 +80,9 @@ static int enable_slot(struct hotplug_slot *hotplug_slot) goto out_deconfigure; pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN); + pci_lock_rescan_remove(); pci_bus_add_devices(slot->zdev->bus); + pci_unlock_rescan_remove(); return rc; @@ -98,7 +100,7 @@ static int disable_slot(struct hotplug_slot *hotplug_slot) return -EIO; if (slot->zdev->pdev) - pci_stop_and_remove_bus_device(slot->zdev->pdev); + pci_stop_and_remove_bus_device_locked(slot->zdev->pdev); rc = zpci_disable_device(slot->zdev); if (rc) diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c index 5b05a68cca6c..613043f7576f 100644 --- a/drivers/pci/hotplug/sgi_hotplug.c +++ b/drivers/pci/hotplug/sgi_hotplug.c @@ -459,12 +459,15 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot) acpi_scan_lock_release(); } + pci_lock_rescan_remove(); + /* Call the driver for the new device */ pci_bus_add_devices(slot->pci_bus); /* Call the drivers for the new devices subordinate to PPB */ if (new_ppb) pci_bus_add_devices(new_bus); + pci_unlock_rescan_remove(); mutex_unlock(&sn_hotplug_mutex); if (rc == 0) @@ -540,6 +543,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot) acpi_scan_lock_release(); } + pci_lock_rescan_remove(); /* Free the SN resources assigned to the Linux device.*/ list_for_each_entry_safe(dev, temp, &slot->pci_bus->devices, bus_list) { if (PCI_SLOT(dev->devfn) != slot->device_num + 1) @@ -550,6 +554,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot) pci_stop_and_remove_bus_device(dev); pci_dev_put(dev); } + pci_unlock_rescan_remove(); /* Remove the SSDT for the slot from the ACPI namespace */ if (SN_ACPI_BASE_SUPPORT() && ssdt_id) { diff --git a/drivers/pci/hotplug/shpchp_pci.c b/drivers/pci/hotplug/shpchp_pci.c index b0e83132542e..2bf69fe1926c 100644 --- a/drivers/pci/hotplug/shpchp_pci.c +++ b/drivers/pci/hotplug/shpchp_pci.c @@ -40,7 +40,9 @@ int __ref shpchp_configure_device(struct slot *p_slot) struct controller *ctrl = p_slot->ctrl; struct pci_dev *bridge = ctrl->pci_dev; struct pci_bus *parent = bridge->subordinate; - int num; + int num, ret = 0; + + pci_lock_rescan_remove(); dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); if (dev) { @@ -48,13 +50,15 @@ int __ref shpchp_configure_device(struct slot *p_slot) "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev), pci_domain_nr(parent), p_slot->bus, p_slot->device); pci_dev_put(dev); - return -EINVAL; + ret = -EINVAL; + goto out; } num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); if (num == 0) { ctrl_err(ctrl, "No new device found\n"); - return -ENODEV; + ret = -ENODEV; + goto out; } list_for_each_entry(dev, &parent->devices, bus_list) { @@ -75,7 +79,9 @@ int __ref shpchp_configure_device(struct slot *p_slot) pci_bus_add_devices(parent); - return 0; + out: + pci_unlock_rescan_remove(); + return ret; } int shpchp_unconfigure_device(struct slot *p_slot) @@ -89,6 +95,8 @@ int shpchp_unconfigure_device(struct slot *p_slot) ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); + pci_lock_rescan_remove(); + list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) { if (PCI_SLOT(dev->devfn) != p_slot->device) continue; @@ -108,6 +116,8 @@ int shpchp_unconfigure_device(struct slot *p_slot) pci_stop_and_remove_bus_device(dev); pci_dev_put(dev); } + + pci_unlock_rescan_remove(); return rc; } diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index c91e6c18debc..276ef9c18802 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -297,7 +297,6 @@ msi_bus_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RW(msi_bus); -static DEFINE_MUTEX(pci_remove_rescan_mutex); static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, size_t count) { @@ -308,10 +307,10 @@ static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, return -EINVAL; if (val) { - mutex_lock(&pci_remove_rescan_mutex); + pci_lock_rescan_remove(); while ((b = pci_find_next_bus(b)) != NULL) pci_rescan_bus(b); - mutex_unlock(&pci_remove_rescan_mutex); + pci_unlock_rescan_remove(); } return count; } @@ -342,9 +341,9 @@ dev_rescan_store(struct device *dev, struct device_attribute *attr, return -EINVAL; if (val) { - mutex_lock(&pci_remove_rescan_mutex); + pci_lock_rescan_remove(); pci_rescan_bus(pdev->bus); - mutex_unlock(&pci_remove_rescan_mutex); + pci_unlock_rescan_remove(); } return count; } @@ -354,11 +353,7 @@ static struct device_attribute dev_rescan_attr = __ATTR(rescan, static void remove_callback(struct device *dev) { - struct pci_dev *pdev = to_pci_dev(dev); - - mutex_lock(&pci_remove_rescan_mutex); - pci_stop_and_remove_bus_device(pdev); - mutex_unlock(&pci_remove_rescan_mutex); + pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); } static ssize_t @@ -395,12 +390,12 @@ dev_bus_rescan_store(struct device *dev, struct device_attribute *attr, return -EINVAL; if (val) { - mutex_lock(&pci_remove_rescan_mutex); + pci_lock_rescan_remove(); if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) pci_rescan_bus_bridge_resize(bus->self); else pci_rescan_bus(bus); - mutex_unlock(&pci_remove_rescan_mutex); + pci_unlock_rescan_remove(); } return count; } diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index c86c8638d3c4..04796c056d12 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2024,6 +2024,24 @@ EXPORT_SYMBOL(pci_scan_slot); EXPORT_SYMBOL(pci_scan_bridge); EXPORT_SYMBOL_GPL(pci_scan_child_bus); +/* + * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal + * routines should always be executed under this mutex. + */ +static DEFINE_MUTEX(pci_rescan_remove_lock); + +void pci_lock_rescan_remove(void) +{ + mutex_lock(&pci_rescan_remove_lock); +} +EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); + +void pci_unlock_rescan_remove(void) +{ + mutex_unlock(&pci_rescan_remove_lock); +} +EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); + static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) { const struct pci_dev *a = to_pci_dev(d_a); diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c index f452148e6d55..4ff36bfa785e 100644 --- a/drivers/pci/remove.c +++ b/drivers/pci/remove.c @@ -20,6 +20,9 @@ static void pci_stop_dev(struct pci_dev *dev) static void pci_destroy_dev(struct pci_dev *dev) { + if (!dev->dev.kobj.parent) + return; + device_del(&dev->dev); put_device(&dev->dev); @@ -95,6 +98,14 @@ void pci_stop_and_remove_bus_device(struct pci_dev *dev) } EXPORT_SYMBOL(pci_stop_and_remove_bus_device); +void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) +{ + pci_lock_rescan_remove(); + pci_stop_and_remove_bus_device(dev); + pci_unlock_rescan_remove(); +} +EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); + void pci_stop_root_bus(struct pci_bus *bus) { struct pci_dev *child, *tmp; diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c index f7197a790341..d1cd60f51f87 100644 --- a/drivers/pci/xen-pcifront.c +++ b/drivers/pci/xen-pcifront.c @@ -471,12 +471,15 @@ static int pcifront_scan_root(struct pcifront_device *pdev, } pcifront_init_sd(sd, domain, bus, pdev); + pci_lock_rescan_remove(); + b = pci_scan_bus_parented(&pdev->xdev->dev, bus, &pcifront_bus_ops, sd); if (!b) { dev_err(&pdev->xdev->dev, "Error creating PCI Frontend Bus!\n"); err = -ENOMEM; + pci_unlock_rescan_remove(); goto err_out; } @@ -494,6 +497,7 @@ static int pcifront_scan_root(struct pcifront_device *pdev, /* Create SysFS and notify udev of the devices. Aka: "going live" */ pci_bus_add_devices(b); + pci_unlock_rescan_remove(); return err; err_out: @@ -556,6 +560,7 @@ static void pcifront_free_roots(struct pcifront_device *pdev) dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); + pci_lock_rescan_remove(); list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { list_del(&bus_entry->list); @@ -568,6 +573,7 @@ static void pcifront_free_roots(struct pcifront_device *pdev) kfree(bus_entry); } + pci_unlock_rescan_remove(); } static pci_ers_result_t pcifront_common_process(int cmd, @@ -1043,8 +1049,10 @@ static int pcifront_detach_devices(struct pcifront_device *pdev) domain, bus, slot, func); continue; } + pci_lock_rescan_remove(); pci_stop_and_remove_bus_device(pci_dev); pci_dev_put(pci_dev); + pci_unlock_rescan_remove(); dev_dbg(&pdev->xdev->dev, "PCI device %04x:%02x:%02x.%d removed.\n", diff --git a/drivers/pcmcia/cardbus.c b/drivers/pcmcia/cardbus.c index b2a98cdbd0d2..8bde61952d20 100644 --- a/drivers/pcmcia/cardbus.c +++ b/drivers/pcmcia/cardbus.c @@ -70,6 +70,8 @@ int __ref cb_alloc(struct pcmcia_socket *s) struct pci_dev *dev; unsigned int max, pass; + pci_lock_rescan_remove(); + s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0)); pci_fixup_cardbus(bus); @@ -93,6 +95,7 @@ int __ref cb_alloc(struct pcmcia_socket *s) pci_bus_add_devices(bus); + pci_unlock_rescan_remove(); return 0; } @@ -115,6 +118,10 @@ void cb_free(struct pcmcia_socket *s) if (!bus) return; + pci_lock_rescan_remove(); + list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) pci_stop_and_remove_bus_device(dev); + + pci_unlock_rescan_remove(); } diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index 19c313b056c3..6fe268f6af91 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -606,6 +606,7 @@ static void asus_rfkill_hotplug(struct asus_wmi *asus) mutex_unlock(&asus->wmi_lock); mutex_lock(&asus->hotplug_lock); + pci_lock_rescan_remove(); if (asus->wlan.rfkill) rfkill_set_sw_state(asus->wlan.rfkill, blocked); @@ -656,6 +657,7 @@ static void asus_rfkill_hotplug(struct asus_wmi *asus) } out_unlock: + pci_unlock_rescan_remove(); mutex_unlock(&asus->hotplug_lock); } diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c index aefcc32e5634..538521b00948 100644 --- a/drivers/platform/x86/eeepc-laptop.c +++ b/drivers/platform/x86/eeepc-laptop.c @@ -592,6 +592,7 @@ static void eeepc_rfkill_hotplug(struct eeepc_laptop *eeepc, acpi_handle handle) rfkill_set_sw_state(eeepc->wlan_rfkill, blocked); mutex_lock(&eeepc->hotplug_lock); + pci_lock_rescan_remove(); if (eeepc->hotplug_slot) { port = acpi_get_pci_dev(handle); @@ -649,6 +650,7 @@ out_put_dev: } out_unlock: + pci_unlock_rescan_remove(); mutex_unlock(&eeepc->hotplug_lock); } diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c index 3901edc35812..bde63f7452bd 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_base.c +++ b/drivers/scsi/mpt2sas/mpt2sas_base.c @@ -128,7 +128,7 @@ static int mpt2sas_remove_dead_ioc_func(void *arg) pdev = ioc->pdev; if ((pdev == NULL)) return -1; - pci_stop_and_remove_bus_device(pdev); + pci_stop_and_remove_bus_device_locked(pdev); return 0; } diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index fa785062e97b..0cf4f7000f94 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -131,7 +131,7 @@ static int mpt3sas_remove_dead_ioc_func(void *arg) pdev = ioc->pdev; if ((pdev == NULL)) return -1; - pci_stop_and_remove_bus_device(pdev); + pci_stop_and_remove_bus_device_locked(pdev); return 0; } diff --git a/include/linux/pci.h b/include/linux/pci.h index 9e3ec8b951b7..2087e6b35545 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -775,6 +775,7 @@ struct pci_dev *pci_dev_get(struct pci_dev *dev); void pci_dev_put(struct pci_dev *dev); void pci_remove_bus(struct pci_bus *b); void pci_stop_and_remove_bus_device(struct pci_dev *dev); +void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev); void pci_stop_root_bus(struct pci_bus *bus); void pci_remove_root_bus(struct pci_bus *bus); void pci_setup_cardbus(struct pci_bus *bus); @@ -1011,6 +1012,8 @@ void set_pcie_hotplug_bridge(struct pci_dev *pdev); int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap); unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge); unsigned int pci_rescan_bus(struct pci_bus *bus); +void pci_lock_rescan_remove(void); +void pci_unlock_rescan_remove(void); /* Vital product data routines */ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf); |