atm/adummy: add syfs DEVICE_ATTR to change signal
Signed-off-by: NKarl Hiramoto <karl@hiramoto.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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Signed-off-by: NKarl Hiramoto <karl@hiramoto.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>