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List:       linux-pci
Subject:    [PATCH] PCI / PM / Runtime: Make runtime PM of PCI devices inactive by default
From:       "Rafael J. Wysocki" <rjw () sisk ! pl>
Date:       2010-02-27 20:37:37
Message-ID: 201002272137.37349.rjw () sisk ! pl
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From: Rafael J. Wysocki <rjw@sisk.pl>

Make the run-time power management of PCI devices be inactive by
default by calling pm_runtime_forbid() for each PCI device during its
initialization.  This setting may be overriden by the user space with
the help of the /sys/devices/.../power/control interface.

That's necessary to avoid breakage on systems where ACPI-based
wake-up is known to fail for some devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 drivers/pci/pci.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -1540,8 +1540,10 @@ void pci_pm_init(struct pci_dev *dev)
 	int pm;
 	u16 pmc;
 
+	pm_runtime_forbid(&dev->dev);
 	device_enable_async_suspend(&dev->dev);
 	dev->wakeup_prepared = false;
+
 	dev->pm_cap = 0;
 
 	/* find PCI PM capability in list */
--
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