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Before this change, unbinding the QMan portals did not trigger a corresponding unbinding of the dpaa_eth making use of it; the first QMan portal related operation issued afterwards crashed the kernel. The device link ensures the dpaa_eth dependency upon the qman portal used is honoured at the QMan portal removal. Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>