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587 giacomo 1
#include <linuxcomp.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include "pci.h"
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//#define DEBUG
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#ifdef DEBUG
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#define DBG(x...) printk(x)
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#else
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#define DBG(x...)
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#endif
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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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        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_destroy_dev(struct pci_dev *dev)
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{
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        pci_proc_detach_device(dev);
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        device_unregister(&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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        spin_lock(&pci_bus_lock);
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        list_del(&dev->bus_list);
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        list_del(&dev->global_list);
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        dev->bus_list.next = dev->bus_list.prev = NULL;
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        dev->global_list.next = dev->global_list.prev = NULL;
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        spin_unlock(&pci_bus_lock);
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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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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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EXPORT_SYMBOL(pci_remove_device_safe);
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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_proc_detach_bus(b);
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                spin_lock(&pci_bus_lock);
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                list_del(&b->node);
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                spin_unlock(&pci_bus_lock);
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                kfree(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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EXPORT_SYMBOL(pci_remove_bus_device);
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EXPORT_SYMBOL(pci_remove_behind_bridge);