ata: add ata port runtime PM callbacks
Add ata port runtime suspend/resume/idle callbacks. Set ->eh_noresume to skip the runtime PM calls on scsi host in the error handler to avoid dead lock. Acked-by: NTejun Heo <tj@kernel.org> Signed-off-by: NLin Ming <ming.m.lin@intel.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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