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PM: Prevent runtime suspend during system resume

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This patch (as1591) moves the pm_runtime_get_noresume() and
pm_runtime_put_sync() calls from __device_suspend() and
device_resume() to device_prepare() and device_complete() in the PM
core.

The reason for doing this is to make sure that parent devices remain
at full power (i.e., don't go into runtime suspend) while their
children are being resumed from a system sleep.

The PCI core already contained equivalent code to serve the same
purpose.  The patch removes the duplicated code, since it is no longer
needed.  One of the comments from the PCI core gets moved into the PM
core, and a second comment is added to explain whe the _get_noresume
and _put_sync calls are present.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Alan Stern
2012-09-19 21:59:02 +02:00
committed by Rafael J. Wysocki
parent 997a031107
commit 88d26136a2
2 changed files with 18 additions and 28 deletions
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17
drivers/pci/pci-driver.c
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@@ -623,21 +623,6 @@ static int pci_pm_prepare(struct device *dev)
struct device_driver *drv = dev->driver;
int error = 0;
/*
* If a PCI device configured to wake up the system from sleep states
* has been suspended at run time and there's a resume request pending
* for it, this is equivalent to the device signaling wakeup, so the
* system suspend operation should be aborted.
*/
pm_runtime_get_noresume(dev);
if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
pm_wakeup_event(dev, 0);
if (pm_wakeup_pending()) {
pm_runtime_put_sync(dev);
return -EBUSY;
}
/*
* PCI devices suspended at run time need to be resumed at this
* point, because in general it is necessary to reconfigure them for
@@ -661,8 +646,6 @@ static void pci_pm_complete(struct device *dev)
if (drv && drv->pm && drv->pm->complete)
drv->pm->complete(dev);
pm_runtime_put_sync(dev);
}
#else /* !CONFIG_PM_SLEEP */