>> +void pci_bus_unfreeze_device(struct pci_bus *bus)
>> +{
>> + unsigned long flags;
>> +
>> + BUG_ON(!bus->save_ops);
>> + spin_lock_irqsave(&pci_freeze_lock, flags);
>> + if (!bus->is_frozen)
>> + goto out;
>
> It seems that the BUG_ON() should placed here, otherwise it will be
> triggered if we try to unfreeze the same bus multiply.
>
Oh, right, I should move it down, thanks for the good catch.
>
>> + pci_bus_set_ops(bus, bus->save_ops);
>> + bus->save_ops = NULL;
>> + bus->is_frozen = 0;
>> +out:
>> + spin_unlock_irqrestore(&pci_freeze_lock, flags);
>> +}
>> +
>> /**
>> * pci_configure_ari - enable or disable ARI forwarding
>> * @dev: the PCI device
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index d60c0b6..e3dd4ea 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -442,6 +442,7 @@ struct pci_bus {
>> struct resource busn_res; /* bus numbers routed to this bus */
>>
>> struct pci_ops *ops; /* configuration access functions */
>> + struct pci_ops *save_ops; /* save configuration access functions */
>> struct msi_chip *msi; /* MSI controller */
>> void *sysdata; /* hook for sys-specific extension */
>> struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */
>> @@ -460,6 +461,7 @@ struct pci_bus {
>> struct bin_attribute *legacy_io; /* legacy I/O for this bus */
>> struct bin_attribute *legacy_mem; /* legacy mem */
>> unsigned int is_added:1;
>> + unsigned int is_frozen:1;
>> };
>>
>> #define pci_bus_b(n) list_entry(n, struct pci_bus, node)
>> @@ -1026,6 +1028,8 @@ ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
>> ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
>>
>> bool pci_serial_number_changed(struct pci_dev *pdev);
>> +void pci_bus_freeze_device(struct pci_bus *bus);
>> +void pci_bus_unfreeze_device(struct pci_bus *bus);
>>
>> /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
>> resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);
>
>
>
> .
>
--
Thanks!
Yijing
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