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[SCSI] check runtime PM status in system PM 

The only high-level SCSI driver that currently implements runtime PM is
sd, and sd treats runtime suspend exactly the same as the SUSPEND and
HIBERNATE stages of system sleep, but not the same as the FREEZE stage.

Therefore, when entering the SUSPEND or HIBERNATE stages of system
sleep, we can skip the callback to the driver if the device is already
in runtime suspend.  When entering the FREEZE stage, however, we should
first issue a runtime resume.  The overhead of doing this is
negligible, because a suspended drive would be spun up during the THAW
stage of hibernation anyway.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Lin Ming 2011-12-05 09:20:25 +08:00 committed by Jeff Garzik
parent ae0751ffc7
commit 286405167e
1 changed files with 15 additions and 1 deletions
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16
drivers/scsi/scsi_pm.c
View File

@ -49,8 +49,22 @@ static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
{
int err = 0;
if (scsi_is_sdev_device(dev))
if (scsi_is_sdev_device(dev)) {
/*
* sd is the only high-level SCSI driver to implement runtime
* PM, and sd treats runtime suspend, system suspend, and
* system hibernate identically (but not system freeze).
*/
if (pm_runtime_suspended(dev)) {
if (msg.event == PM_EVENT_SUSPEND ||
msg.event == PM_EVENT_HIBERNATE)
return 0; /* already suspended */
/* wake up device so that FREEZE will succeed */
pm_runtime_resume(dev);
}
err = scsi_dev_type_suspend(dev, msg);
}
return err;
}