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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2010-02-08 19:18:26 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2010-02-26 20:39:12 +0100 |
| commit | 4cb077d93a57fb8bb64c277ec4ce637823cd76f4 (patch) | |
| tree | 2035b21282c5746c869065cf917ef06c1c4c7848 | |
| parent | 927bc9165d3cd01054b472f9b25d91a8707209c8 (diff) | |
| download | blackbird-op-linux-4cb077d93a57fb8bb64c277ec4ce637823cd76f4.tar.gz blackbird-op-linux-4cb077d93a57fb8bb64c277ec4ce637823cd76f4.zip | |
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>
| -rw-r--r-- | drivers/scsi/hosts.c | 4 | ||||
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 554626e18062..09dbcb847b73 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -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; 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"); |
