Commit 4cb077d9 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

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: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 927bc916

drivers/scsi/hosts.c

+4 −0
Original line number Diff line number Diff line
@@ -215,6 +215,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, 
		shost->shost_gendev.parent = dev ? dev : &platform_bus;

	shost->dma_dev = dma_dev;



	device_enable_async_suspend(&shost->shost_gendev);



	error = device_add(&shost->shost_gendev);

	if (error)

		goto out;
@@ -222,6 +224,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, 
	scsi_host_set_state(shost, SHOST_RUNNING);

	get_device(shost->shost_gendev.parent);



	device_enable_async_suspend(&shost->shost_dev);



	error = device_add(&shost->shost_dev);

	if (error)

		goto out_del_gendev;

drivers/scsi/scsi_sysfs.c

+4 −0
Original line number Diff line number Diff line
@@ -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");

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