PM: Allow SCSI devices to suspend/resume asynchronously

Set power.async_suspend for all SCSI devices, targets and hosts, so
that they can be suspended and resumed in parallel with the main
suspend/resume thread and possibly with other devices they don't
depend on in a known way (i.e. devices which are not their parents or
children).

The power.async_suspend flag is also set for devices that don't have
suspend or resume callbacks, because otherwise they would make the
main suspend/resume thread wait for their "asynchronous" children
(during suspend) or parents (during resume), effectively negating the
possible gains from executing these devices' suspend and resume
callbacks asynchronously.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 5a065055e68a..c5580805a359 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -847,6 +847,8 @@ static int scsi_target_add(struct scsi_target *starget)
         if (starget->state != STARGET_CREATED)
                 return 0;
 
+        device_enable_async_suspend(&starget->dev);
+
         error = device_add(&starget->dev);
         if (error) {
                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
@@ -886,11 +888,13 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
                 return error;
 
         transport_configure_device(&starget->dev);
+        device_enable_async_suspend(&sdev->sdev_gendev);
         error = device_add(&sdev->sdev_gendev);
         if (error) {
                 printk(KERN_INFO "error 1\n");
                 goto out_remove;
         }
+        device_enable_async_suspend(&sdev->sdev_dev);
         error = device_add(&sdev->sdev_dev);
         if (error) {
                 printk(KERN_INFO "error 2\n");