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While grant reference is of type uint32_t, xen-netfront erroneously casts it to signed short in BUG_ON(). This would lead to the xen domU panic during boot-up or migration when it is attached with lots of paravirtual devices. Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>