On Mon, 2014-02-10 at 12:04 +0800, Yijing Wang wrote:
> +static DEFINE_SPINLOCK(pci_freeze_lock);
The lock is used only here.
> +/**
> + * pci_bus_freeze_device - freeze pci bus to access pci device
> + * @bus: the pci bus to freeze
> + *
> + * Replace pci bus ops by pci_dummy_ops, protect system from
> + * accessing pci devices.
> + */
> +void pci_bus_freeze_device(struct pci_bus *bus)
> +{
> + struct pci_ops *ops;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&pci_freeze_lock, flags);
> + ops = pci_bus_set_ops(bus, &pci_dummy_ops);
> + bus->save_ops = ops;
> + spin_unlock_irqrestore(&pci_freeze_lock, flags);
Against what exactly are you locking here?
Regards
Oliver
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