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path: root/drivers/pci/pci.c
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-rw-r--r--drivers/pci/pci.c37
1 files changed, 27 insertions, 10 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a04197ce767d..dbfe7c4f3776 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1910,7 +1910,7 @@ void pci_pme_active(struct pci_dev *dev, bool enable)
EXPORT_SYMBOL(pci_pme_active);
/**
- * pci_enable_wake - enable PCI device as wakeup event source
+ * __pci_enable_wake - enable PCI device as wakeup event source
* @dev: PCI device affected
* @state: PCI state from which device will issue wakeup events
* @enable: True to enable event generation; false to disable
@@ -1928,7 +1928,7 @@ EXPORT_SYMBOL(pci_pme_active);
* Error code depending on the platform is returned if both the platform and
* the native mechanism fail to enable the generation of wake-up events
*/
-int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
+static int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
{
int ret = 0;
@@ -1969,6 +1969,23 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable)
return ret;
}
+
+/**
+ * pci_enable_wake - change wakeup settings for a PCI device
+ * @pci_dev: Target device
+ * @state: PCI state from which device will issue wakeup events
+ * @enable: Whether or not to enable event generation
+ *
+ * If @enable is set, check device_may_wakeup() for the device before calling
+ * __pci_enable_wake() for it.
+ */
+int pci_enable_wake(struct pci_dev *pci_dev, pci_power_t state, bool enable)
+{
+ if (enable && !device_may_wakeup(&pci_dev->dev))
+ return -EINVAL;
+
+ return __pci_enable_wake(pci_dev, state, enable);
+}
EXPORT_SYMBOL(pci_enable_wake);
/**
@@ -1981,9 +1998,9 @@ EXPORT_SYMBOL(pci_enable_wake);
* should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
* ordering constraints.
*
- * This function only returns error code if the device is not capable of
- * generating PME# from both D3_hot and D3_cold, and the platform is unable to
- * enable wake-up power for it.
+ * This function only returns error code if the device is not allowed to wake
+ * up the system from sleep or it is not capable of generating PME# from both
+ * D3_hot and D3_cold and the platform is unable to enable wake-up power for it.
*/
int pci_wake_from_d3(struct pci_dev *dev, bool enable)
{
@@ -2114,7 +2131,7 @@ int pci_finish_runtime_suspend(struct pci_dev *dev)
dev->runtime_d3cold = target_state == PCI_D3cold;
- pci_enable_wake(dev, target_state, pci_dev_run_wake(dev));
+ __pci_enable_wake(dev, target_state, pci_dev_run_wake(dev));
error = pci_set_power_state(dev, target_state);
@@ -2138,16 +2155,16 @@ bool pci_dev_run_wake(struct pci_dev *dev)
{
struct pci_bus *bus = dev->bus;
- if (device_can_wakeup(&dev->dev))
- return true;
-
if (!dev->pme_support)
return false;
/* PME-capable in principle, but not from the target power state */
- if (!pci_pme_capable(dev, pci_target_state(dev, false)))
+ if (!pci_pme_capable(dev, pci_target_state(dev, true)))
return false;
+ if (device_can_wakeup(&dev->dev))
+ return true;
+
while (bus->parent) {
struct pci_dev *bridge = bus->self;