PCI: Rework default handling of suspend and resume
Rework the handling of suspend and resume of PCI devices which have
no drivers or the drivers of which do not provide any suspend-resume
callbacks in such a way that their standard PCI configuration
registers will be saved and restored with interrupts disabled. This
should prevent such devices, including PCI bridges, from being
resumed too late to be able to function correctly during the resume
of the other PCI devices that may depend on them.
Also, to remove one possible source of future confusion, drop the
default handling of suspend and resume for PCI devices with drivers
providing the 'pm' object introduced by the new suspend-resume
framework (there are no such PCI drivers at the moment).
This patch addresses the regression from 2.6.26 tracked as
http://bugzilla.kernel.org/show_bug.cgi?id=12121 .
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 4042d21..99d867b 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -300,6 +300,14 @@
#ifdef CONFIG_PM_SLEEP
+static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
+{
+ struct pci_driver *drv = pci_dev->driver;
+
+ return drv && (drv->suspend || drv->suspend_late || drv->resume
+ || drv->resume_early);
+}
+
/*
* Default "suspend" method for devices that have no driver provided suspend,
* or not even a driver at all.
@@ -317,14 +325,22 @@
/*
* Default "resume" method for devices that have no driver provided resume,
- * or not even a driver at all.
+ * or not even a driver at all (first part).
*/
-static int pci_default_pm_resume(struct pci_dev *pci_dev)
+static void pci_default_pm_resume_early(struct pci_dev *pci_dev)
{
- int retval = 0;
-
/* restore the PCI config space */
pci_restore_state(pci_dev);
+}
+
+/*
+ * Default "resume" method for devices that have no driver provided resume,
+ * or not even a driver at all (second part).
+ */
+static int pci_default_pm_resume_late(struct pci_dev *pci_dev)
+{
+ int retval;
+
/* if the device was enabled before suspend, reenable */
retval = pci_reenable_device(pci_dev);
/*
@@ -371,10 +387,12 @@
struct pci_dev * pci_dev = to_pci_dev(dev);
struct pci_driver * drv = pci_dev->driver;
- if (drv && drv->resume)
+ if (drv && drv->resume) {
error = drv->resume(pci_dev);
- else
- error = pci_default_pm_resume(pci_dev);
+ } else {
+ pci_default_pm_resume_early(pci_dev);
+ error = pci_default_pm_resume_late(pci_dev);
+ }
return error;
}
@@ -420,10 +438,8 @@
if (drv->pm->suspend) {
error = drv->pm->suspend(dev);
suspend_report_result(drv->pm->suspend, error);
- } else {
- pci_default_pm_suspend(pci_dev);
}
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend(dev, PMSG_SUSPEND);
}
pci_fixup_device(pci_fixup_suspend, pci_dev);
@@ -433,6 +449,7 @@
static int pci_pm_suspend_noirq(struct device *dev)
{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
int error = 0;
@@ -441,8 +458,10 @@
error = drv->pm->suspend_noirq(dev);
suspend_report_result(drv->pm->suspend_noirq, error);
}
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend_late(dev, PMSG_SUSPEND);
+ } else {
+ pci_default_pm_suspend(pci_dev);
}
return error;
@@ -452,15 +471,17 @@
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
- int error;
+ int error = 0;
pci_fixup_device(pci_fixup_resume, pci_dev);
if (drv && drv->pm) {
- error = drv->pm->resume ? drv->pm->resume(dev) :
- pci_default_pm_resume(pci_dev);
- } else {
+ if (drv->pm->resume)
+ error = drv->pm->resume(dev);
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_resume(dev);
+ } else {
+ error = pci_default_pm_resume_late(pci_dev);
}
return error;
@@ -468,6 +489,7 @@
static int pci_pm_resume_noirq(struct device *dev)
{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
int error = 0;
@@ -476,8 +498,10 @@
if (drv && drv->pm) {
if (drv->pm->resume_noirq)
error = drv->pm->resume_noirq(dev);
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_resume_early(dev);
+ } else {
+ pci_default_pm_resume_early(pci_dev);
}
return error;
@@ -504,10 +528,8 @@
if (drv->pm->freeze) {
error = drv->pm->freeze(dev);
suspend_report_result(drv->pm->freeze, error);
- } else {
- pci_default_pm_suspend(pci_dev);
}
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend(dev, PMSG_FREEZE);
pci_fixup_device(pci_fixup_suspend, pci_dev);
}
@@ -517,6 +539,7 @@
static int pci_pm_freeze_noirq(struct device *dev)
{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
int error = 0;
@@ -525,8 +548,10 @@
error = drv->pm->freeze_noirq(dev);
suspend_report_result(drv->pm->freeze_noirq, error);
}
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend_late(dev, PMSG_FREEZE);
+ } else {
+ pci_default_pm_suspend(pci_dev);
}
return error;
@@ -534,14 +559,15 @@
static int pci_pm_thaw(struct device *dev)
{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
int error = 0;
if (drv && drv->pm) {
if (drv->pm->thaw)
error = drv->pm->thaw(dev);
- } else {
- pci_fixup_device(pci_fixup_resume, to_pci_dev(dev));
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
error = pci_legacy_resume(dev);
}
@@ -550,13 +576,14 @@
static int pci_pm_thaw_noirq(struct device *dev)
{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
int error = 0;
if (drv && drv->pm) {
if (drv->pm->thaw_noirq)
error = drv->pm->thaw_noirq(dev);
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev));
error = pci_legacy_resume_early(dev);
}
@@ -566,17 +593,18 @@
static int pci_pm_poweroff(struct device *dev)
{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
int error = 0;
- pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
+ pci_fixup_device(pci_fixup_suspend, pci_dev);
if (drv && drv->pm) {
if (drv->pm->poweroff) {
error = drv->pm->poweroff(dev);
suspend_report_result(drv->pm->poweroff, error);
}
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
}
@@ -593,7 +621,7 @@
error = drv->pm->poweroff_noirq(dev);
suspend_report_result(drv->pm->poweroff_noirq, error);
}
- } else {
+ } else if (pci_has_legacy_pm_support(to_pci_dev(dev))) {
error = pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
}
@@ -604,13 +632,15 @@
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
- int error;
+ int error = 0;
if (drv && drv->pm) {
- error = drv->pm->restore ? drv->pm->restore(dev) :
- pci_default_pm_resume(pci_dev);
- } else {
+ if (drv->pm->restore)
+ error = drv->pm->restore(dev);
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_resume(dev);
+ } else {
+ error = pci_default_pm_resume_late(pci_dev);
}
pci_fixup_device(pci_fixup_resume, pci_dev);
@@ -628,8 +658,10 @@
if (drv && drv->pm) {
if (drv->pm->restore_noirq)
error = drv->pm->restore_noirq(dev);
- } else {
+ } else if (pci_has_legacy_pm_support(pci_dev)) {
error = pci_legacy_resume_early(dev);
+ } else {
+ pci_default_pm_resume_early(pci_dev);
}
pci_fixup_device(pci_fixup_resume_early, pci_dev);