xen/pciback: Document when the 'unbind' and 'bind' functions are called.
And also mention that you cannot do any pci_reset_function, pci_reset_slot, or such calls. This is because they take the same lock as SysFS does - and we would end up with a dead-lock if we call those functions. Signed-off-by:Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by:
David Vrabel <david.vrabel@citrix.com>
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