libata: forbid port runtime pm by default, fixing regression

commit 0c8d32c27f5cf6e14ca14b4758d1e994eebd50fd upstream.

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: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index 74aaee30e264ce1959c3807cb6a9e4c8bad27c95..c341904853770f7dad45e5cc4e1180f76111e322 100644 (file)
--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -294,6 +294,7 @@ int ata_tport_add(struct device *parent,
        device_enable_async_suspend(dev);
        pm_runtime_set_active(dev);
        pm_runtime_enable(dev);
+       pm_runtime_forbid(dev);
 
        transport_add_device(dev);
        transport_configure_device(dev);