- 论坛徽章:
- 4
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- bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
- int crs_timeout)
- {
- int delay = 1;
- if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
- return false;
- /* some broken boards return 0 or ~0 if a slot is empty: */
- if (*l == 0xffffffff || *l == 0x00000000 ||
- *l == 0x0000ffff || *l == 0xffff0000)
- return false;
- /* Configuration request Retry Status */
- while (*l == 0xffff0001) {------------>0xffff0001 哪里来的?
- if (!crs_timeout)
- return false;
- msleep(delay);
- delay *= 2;
- if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
- return false;
- /* Card hasn't responded in 60 seconds? Must be stuck. */
- if (delay > crs_timeout) {
- printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
- "responding\n", pci_domain_nr(bus),
- bus->number, PCI_SLOT(devfn),
- PCI_FUNC(devfn));
- return false;
- }
- }
- return true;
- }
- EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
复制代码 求解,谢谢! |
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