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authorAlan Stern <stern@rowland.harvard.edu>2012-09-19 21:59:02 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-09-19 21:59:02 +0200
commit88d26136a256576e444db312179e17af6dd0ea87 (patch)
tree21bd82f6880a91708549512fdb42bc4c79b4ea98 /drivers/pci
parent997a031107ec962967ce36db9bc500f1fad491c1 (diff)
downloadlinux-88d26136a256576e444db312179e17af6dd0ea87.tar.bz2
PM: Prevent runtime suspend during system resume
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci-driver.c17
1 files changed, 0 insertions, 17 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 185be3703343..51cd90bcdd4c 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -624,21 +624,6 @@ static int pci_pm_prepare(struct device *dev)
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
* system suspend. Namely, if the device is supposed to wake up the
@@ -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 */