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authorAlan Stern <stern@rowland.harvard.edu>2010-03-23 02:50:07 +0300
committerRafael J. Wysocki <rjw@sisk.pl>2010-05-11 01:08:16 +0400
commit240c7337a4cd3d91b196c5ef97ad461b3a22fa09 (patch)
tree252a5938fa8c9f75925653876c32bef1a2ed899b /drivers/base
parent228c54ef7a028d5a4b6606eb0c8035874d9b6788 (diff)
downloadlinux-240c7337a4cd3d91b196c5ef97ad461b3a22fa09.tar.xz
PM: Allow runtime_suspend methods to call pm_schedule_suspend()
This patch (as1361) changes the runtime PM interface slightly; it allows suspend requests to be scheduled while the runtime_suspend method is running. If the method succeeds then the scheduled request is cancelled, whereas if the method fails then an idle notification is sent only if no request was scheduled. Being able to schedule suspend requests from within a runtime_suspend method is useful for drivers that need to test for idleness and suspend the device all while holding a single spinlock, or for drivers that want to check for idleness by polling. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/runtime.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 626dd147b75f..b0ec0e9f27e9 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -229,14 +229,16 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq)
if (retval) {
dev->power.runtime_status = RPM_ACTIVE;
- pm_runtime_cancel_pending(dev);
-
if (retval == -EAGAIN || retval == -EBUSY) {
- notify = true;
+ if (dev->power.timer_expires == 0)
+ notify = true;
dev->power.runtime_error = 0;
+ } else {
+ pm_runtime_cancel_pending(dev);
}
} else {
dev->power.runtime_status = RPM_SUSPENDED;
+ pm_runtime_deactivate_timer(dev);
if (dev->parent) {
parent = dev->parent;
@@ -659,8 +661,6 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay)
if (dev->power.runtime_status == RPM_SUSPENDED)
retval = 1;
- else if (dev->power.runtime_status == RPM_SUSPENDING)
- retval = -EINPROGRESS;
else if (atomic_read(&dev->power.usage_count) > 0
|| dev->power.disable_depth > 0)
retval = -EAGAIN;