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-rw-r--r--drivers/pci/pci-acpi.c3
-rw-r--r--drivers/pci/pci.c41
-rw-r--r--drivers/pci/pcie/pme.c9
-rw-r--r--include/linux/pci.h1
4 files changed, 33 insertions, 21 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index d36f41e..cd3c4f1 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -46,6 +46,9 @@ static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
struct pci_dev *pci_dev = context;
if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_dev) {
+ if (pci_dev->pme_poll)
+ pci_dev->pme_poll = false;
+
pci_wakeup_event(pci_dev);
pci_check_pme_status(pci_dev);
pm_runtime_resume(&pci_dev->dev);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e9651f0..7cd417e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1407,13 +1407,16 @@ bool pci_check_pme_status(struct pci_dev *dev)
/**
* pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
* @dev: Device to handle.
- * @ign: Ignored.
+ * @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
*
* Check if @dev has generated PME and queue a resume request for it in that
* case.
*/
-static int pci_pme_wakeup(struct pci_dev *dev, void *ign)
+static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset)
{
+ if (pme_poll_reset && dev->pme_poll)
+ dev->pme_poll = false;
+
if (pci_check_pme_status(dev)) {
pci_wakeup_event(dev);
pm_request_resume(&dev->dev);
@@ -1428,7 +1431,7 @@ static int pci_pme_wakeup(struct pci_dev *dev, void *ign)
void pci_pme_wakeup_bus(struct pci_bus *bus)
{
if (bus)
- pci_walk_bus(bus, pci_pme_wakeup, NULL);
+ pci_walk_bus(bus, pci_pme_wakeup, (void *)true);
}
/**
@@ -1446,31 +1449,26 @@ bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
static void pci_pme_list_scan(struct work_struct *work)
{
- struct pci_pme_device *pme_dev;
+ struct pci_pme_device *pme_dev, *n;
mutex_lock(&pci_pme_list_mutex);
if (!list_empty(&pci_pme_list)) {
- list_for_each_entry(pme_dev, &pci_pme_list, list)
- pci_pme_wakeup(pme_dev->dev, NULL);
- schedule_delayed_work(&pci_pme_work, msecs_to_jiffies(PME_TIMEOUT));
+ list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
+ if (pme_dev->dev->pme_poll) {
+ pci_pme_wakeup(pme_dev->dev, NULL);
+ } else {
+ list_del(&pme_dev->list);
+ kfree(pme_dev);
+ }
+ }
+ if (!list_empty(&pci_pme_list))
+ schedule_delayed_work(&pci_pme_work,
+ msecs_to_jiffies(PME_TIMEOUT));
}
mutex_unlock(&pci_pme_list_mutex);
}
/**
- * pci_external_pme - is a device an external PCI PME source?
- * @dev: PCI device to check
- *
- */
-
-static bool pci_external_pme(struct pci_dev *dev)
-{
- if (pci_is_pcie(dev) || dev->bus->number == 0)
- return false;
- return true;
-}
-
-/**
* pci_pme_active - enable or disable PCI device's PME# function
* @dev: PCI device to handle.
* @enable: 'true' to enable PME# generation; 'false' to disable it.
@@ -1503,7 +1501,7 @@ void pci_pme_active(struct pci_dev *dev, bool enable)
hit, and the power savings from the devices will still be a
win. */
- if (pci_external_pme(dev)) {
+ if (dev->pme_poll) {
struct pci_pme_device *pme_dev;
if (enable) {
pme_dev = kmalloc(sizeof(struct pci_pme_device),
@@ -1821,6 +1819,7 @@ void pci_pm_init(struct pci_dev *dev)
(pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
(pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT;
+ dev->pme_poll = true;
/*
* Make device's PM flags reflect the wake-up capability, but
* let the user space enable it to wake up the system as needed.
diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index 0057344..001f1b7 100644
--- a/drivers/pci/pcie/pme.c
+++ b/drivers/pci/pcie/pme.c
@@ -84,6 +84,9 @@ static bool pcie_pme_walk_bus(struct pci_bus *bus)
list_for_each_entry(dev, &bus->devices, bus_list) {
/* Skip PCIe devices in case we started from a root port. */
if (!pci_is_pcie(dev) && pci_check_pme_status(dev)) {
+ if (dev->pme_poll)
+ dev->pme_poll = false;
+
pci_wakeup_event(dev);
pm_request_resume(&dev->dev);
ret = true;
@@ -142,6 +145,9 @@ static void pcie_pme_handle_request(struct pci_dev *port, u16 req_id)
/* First, check if the PME is from the root port itself. */
if (port->devfn == devfn && port->bus->number == busnr) {
+ if (port->pme_poll)
+ port->pme_poll = false;
+
if (pci_check_pme_status(port)) {
pm_request_resume(&port->dev);
found = true;
@@ -187,6 +193,9 @@ static void pcie_pme_handle_request(struct pci_dev *port, u16 req_id)
/* The device is there, but we have to check its PME status. */
found = pci_check_pme_status(dev);
if (found) {
+ if (dev->pme_poll)
+ dev->pme_poll = false;
+
pci_wakeup_event(dev);
pm_request_resume(&dev->dev);
}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 4ff6d4e..176c981 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -273,6 +273,7 @@ struct pci_dev {
unsigned int pme_support:5; /* Bitmask of states from which PME#
can be generated */
unsigned int pme_interrupt:1;
+ unsigned int pme_poll:1; /* Poll device's PME status bit */
unsigned int d1_support:1; /* Low power state D1 is supported */
unsigned int d2_support:1; /* Low power state D2 is supported */
unsigned int no_d1d2:1; /* Only allow D0 and D3 */