sparc64: ensure LDC channel is ready before communication
Ensure that LDC channel is up before writing to it, in RAW mode. Generate event to bring the LDC channel up, if it's not up already. Signed-off-by: NJagannathan Raman <jag.raman@oracle.com> Reviewed-by: NAaron Young <aaron.young@oracle.com> Reviewed-by: NAlexandre Chartre <alexandre.chartre@oracle.com> Reviewed-by: NBijan Mottahedeh <bijan.mottahedeh@oracle.com> Reviewed-by: NLiam Merwick <liam.merwick@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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