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https://github.com/edk2-porting/linux-next.git
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5ff580c10e
This patch finally removes the global list of PCI devices. We are relying entirely on the list held in the driver core now, and do not need a separate "shadow" list as no one uses it. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
#include <linux/pci.h>
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#include <linux/module.h>
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#include "pci.h"
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static void pci_free_resources(struct pci_dev *dev)
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{
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int i;
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msi_remove_pci_irq_vectors(dev);
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pci_cleanup_rom(dev);
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *res = dev->resource + i;
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if (res->parent)
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release_resource(res);
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}
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}
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static void pci_stop_dev(struct pci_dev *dev)
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{
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if (dev->is_added) {
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pci_proc_detach_device(dev);
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pci_remove_sysfs_dev_files(dev);
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device_unregister(&dev->dev);
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dev->is_added = 0;
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}
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}
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static void pci_destroy_dev(struct pci_dev *dev)
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{
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pci_stop_dev(dev);
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/* Remove the device from the device lists, and prevent any further
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* list accesses from this device */
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down_write(&pci_bus_sem);
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list_del(&dev->bus_list);
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dev->bus_list.next = dev->bus_list.prev = NULL;
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up_write(&pci_bus_sem);
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pci_free_resources(dev);
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pci_dev_put(dev);
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}
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/**
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* pci_remove_device_safe - remove an unused hotplug device
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* @dev: the device to remove
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*
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* Delete the device structure from the device lists and
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* notify userspace (/sbin/hotplug), but only if the device
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* in question is not being used by a driver.
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* Returns 0 on success.
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*/
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#if 0
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int pci_remove_device_safe(struct pci_dev *dev)
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{
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if (pci_dev_driver(dev))
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return -EBUSY;
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pci_destroy_dev(dev);
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return 0;
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}
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#endif /* 0 */
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void pci_remove_bus(struct pci_bus *pci_bus)
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{
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pci_proc_detach_bus(pci_bus);
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down_write(&pci_bus_sem);
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list_del(&pci_bus->node);
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up_write(&pci_bus_sem);
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pci_remove_legacy_files(pci_bus);
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device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
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device_unregister(&pci_bus->dev);
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}
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EXPORT_SYMBOL(pci_remove_bus);
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/**
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* pci_remove_bus_device - remove a PCI device and any children
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* @dev: the device to remove
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*
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* Remove a PCI device from the device lists, informing the drivers
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* that the device has been removed. We also remove any subordinate
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* buses and children in a depth-first manner.
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*
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* For each device we remove, delete the device structure from the
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* device lists, remove the /proc entry, and notify userspace
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* (/sbin/hotplug).
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*/
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void pci_remove_bus_device(struct pci_dev *dev)
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{
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if (dev->subordinate) {
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struct pci_bus *b = dev->subordinate;
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pci_remove_behind_bridge(dev);
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pci_remove_bus(b);
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dev->subordinate = NULL;
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}
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pci_destroy_dev(dev);
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}
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/**
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* pci_remove_behind_bridge - remove all devices behind a PCI bridge
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* @dev: PCI bridge device
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*
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* Remove all devices on the bus, except for the parent bridge.
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* This also removes any child buses, and any devices they may
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* contain in a depth-first manner.
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*/
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void pci_remove_behind_bridge(struct pci_dev *dev)
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{
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struct list_head *l, *n;
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if (dev->subordinate) {
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list_for_each_safe(l, n, &dev->subordinate->devices) {
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struct pci_dev *dev = pci_dev_b(l);
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pci_remove_bus_device(dev);
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}
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}
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}
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static void pci_stop_bus_devices(struct pci_bus *bus)
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{
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struct list_head *l, *n;
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list_for_each_safe(l, n, &bus->devices) {
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struct pci_dev *dev = pci_dev_b(l);
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pci_stop_bus_device(dev);
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}
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}
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/**
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* pci_stop_bus_device - stop a PCI device and any children
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* @dev: the device to stop
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*
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* Stop a PCI device (detach the driver, remove from the global list
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* and so on). This also stop any subordinate buses and children in a
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* depth-first manner.
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*/
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void pci_stop_bus_device(struct pci_dev *dev)
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{
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if (dev->subordinate)
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pci_stop_bus_devices(dev->subordinate);
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pci_stop_dev(dev);
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}
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EXPORT_SYMBOL(pci_remove_bus_device);
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EXPORT_SYMBOL(pci_remove_behind_bridge);
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EXPORT_SYMBOL_GPL(pci_stop_bus_device);
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