1 #include <linux/pci.h> 2 #include <linux/module.h> 3 #include "pci.h" 4 5 static void pci_free_resources(struct pci_dev *dev) 6 { 7 int i; 8 9 msi_remove_pci_irq_vectors(dev); 10 11 pci_cleanup_rom(dev); 12 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 13 struct resource *res = dev->resource + i; 14 if (res->parent) 15 release_resource(res); 16 } 17 } 18 19 static void pci_stop_dev(struct pci_dev *dev) 20 { 21 if (!dev->global_list.next) 22 return; 23 24 if (!list_empty(&dev->global_list)) { 25 pci_proc_detach_device(dev); 26 pci_remove_sysfs_dev_files(dev); 27 device_unregister(&dev->dev); 28 down_write(&pci_bus_sem); 29 list_del(&dev->global_list); 30 dev->global_list.next = dev->global_list.prev = NULL; 31 up_write(&pci_bus_sem); 32 } 33 } 34 35 static void pci_destroy_dev(struct pci_dev *dev) 36 { 37 pci_stop_dev(dev); 38 39 /* Remove the device from the device lists, and prevent any further 40 * list accesses from this device */ 41 down_write(&pci_bus_sem); 42 list_del(&dev->bus_list); 43 dev->bus_list.next = dev->bus_list.prev = NULL; 44 up_write(&pci_bus_sem); 45 46 pci_free_resources(dev); 47 pci_dev_put(dev); 48 } 49 50 /** 51 * pci_remove_device_safe - remove an unused hotplug device 52 * @dev: the device to remove 53 * 54 * Delete the device structure from the device lists and 55 * notify userspace (/sbin/hotplug), but only if the device 56 * in question is not being used by a driver. 57 * Returns 0 on success. 58 */ 59 #if 0 60 int pci_remove_device_safe(struct pci_dev *dev) 61 { 62 if (pci_dev_driver(dev)) 63 return -EBUSY; 64 pci_destroy_dev(dev); 65 return 0; 66 } 67 #endif /* 0 */ 68 69 void pci_remove_bus(struct pci_bus *pci_bus) 70 { 71 pci_proc_detach_bus(pci_bus); 72 73 down_write(&pci_bus_sem); 74 list_del(&pci_bus->node); 75 up_write(&pci_bus_sem); 76 pci_remove_legacy_files(pci_bus); 77 class_device_remove_file(&pci_bus->class_dev, 78 &class_device_attr_cpuaffinity); 79 sysfs_remove_link(&pci_bus->class_dev.kobj, "bridge"); 80 class_device_unregister(&pci_bus->class_dev); 81 } 82 EXPORT_SYMBOL(pci_remove_bus); 83 84 /** 85 * pci_remove_bus_device - remove a PCI device and any children 86 * @dev: the device to remove 87 * 88 * Remove a PCI device from the device lists, informing the drivers 89 * that the device has been removed. We also remove any subordinate 90 * buses and children in a depth-first manner. 91 * 92 * For each device we remove, delete the device structure from the 93 * device lists, remove the /proc entry, and notify userspace 94 * (/sbin/hotplug). 95 */ 96 void pci_remove_bus_device(struct pci_dev *dev) 97 { 98 if (dev->subordinate) { 99 struct pci_bus *b = dev->subordinate; 100 101 pci_remove_behind_bridge(dev); 102 pci_remove_bus(b); 103 dev->subordinate = NULL; 104 } 105 106 pci_destroy_dev(dev); 107 } 108 109 /** 110 * pci_remove_behind_bridge - remove all devices behind a PCI bridge 111 * @dev: PCI bridge device 112 * 113 * Remove all devices on the bus, except for the parent bridge. 114 * This also removes any child buses, and any devices they may 115 * contain in a depth-first manner. 116 */ 117 void pci_remove_behind_bridge(struct pci_dev *dev) 118 { 119 struct list_head *l, *n; 120 121 if (dev->subordinate) { 122 list_for_each_safe(l, n, &dev->subordinate->devices) { 123 struct pci_dev *dev = pci_dev_b(l); 124 125 pci_remove_bus_device(dev); 126 } 127 } 128 } 129 130 static void pci_stop_bus_devices(struct pci_bus *bus) 131 { 132 struct list_head *l, *n; 133 134 list_for_each_safe(l, n, &bus->devices) { 135 struct pci_dev *dev = pci_dev_b(l); 136 pci_stop_bus_device(dev); 137 } 138 } 139 140 /** 141 * pci_stop_bus_device - stop a PCI device and any children 142 * @dev: the device to stop 143 * 144 * Stop a PCI device (detach the driver, remove from the global list 145 * and so on). This also stop any subordinate buses and children in a 146 * depth-first manner. 147 */ 148 void pci_stop_bus_device(struct pci_dev *dev) 149 { 150 if (dev->subordinate) 151 pci_stop_bus_devices(dev->subordinate); 152 153 pci_stop_dev(dev); 154 } 155 156 EXPORT_SYMBOL(pci_remove_bus_device); 157 EXPORT_SYMBOL(pci_remove_behind_bridge); 158 EXPORT_SYMBOL_GPL(pci_stop_bus_device); 159