libata: forbid port runtime pm by default, fixing regression
Forbid port runtime pm by default because it has known hotplug issue. User can allow it by, for example echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata2/power/control Signed-off-by: NLin Ming <ming.m.lin@intel.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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