xen-pcifront: Handle backend CLOSED without CLOSING
Backend drivers shouldn't transition to CLOSED unless the frontend is CLOSED. If a backend does transition to CLOSED too soon then the frontend may not see the CLOSING state and will not properly shutdown. So, treat an unexpected backend CLOSED state the same as CLOSING. Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Acked-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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