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authorRafael J. Wysocki <rjw@sisk.pl>2010-11-11 01:50:53 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2010-11-11 01:50:53 +0100
commitd08a5ace18dce9b18d8eb56bb6c0feef082b1b33 (patch)
tree401e2aa7312a2ae682433e6b320fee9feab071bd /drivers/base
parentf6614b7bb405a9b35dd28baea989a749492c46b2 (diff)
downloadlinux-d08a5ace18dce9b18d8eb56bb6c0feef082b1b33.tar.bz2
PM: Allow devices to be removed during late suspend and early resume
Holding dpm_list_mtx across late suspend and early resume of devices is problematic for the PCMCIA subsystem and doesn't allow device objects to be removed by late suspend and early resume driver callbacks. This appears to be overly restrictive, as drivers are generally allowed to remove device objects in other phases of suspend and resume. Therefore rework dpm_{suspend|resume}_noirq() so that they don't have to hold dpm_list_mtx all the time. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/main.c34
1 files changed, 30 insertions, 4 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 31b526661ec4..ead3e79d6fcf 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -475,20 +475,33 @@ End:
*/
void dpm_resume_noirq(pm_message_t state)
{
- struct device *dev;
+ struct list_head list;
ktime_t starttime = ktime_get();
+ INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
transition_started = false;
- list_for_each_entry(dev, &dpm_list, power.entry)
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.next);
+
+ get_device(dev);
if (dev->power.status > DPM_OFF) {
int error;
dev->power.status = DPM_OFF;
+ mutex_unlock(&dpm_list_mtx);
+
error = device_resume_noirq(dev, state);
+
+ mutex_lock(&dpm_list_mtx);
if (error)
pm_dev_err(dev, state, " early", error);
}
+ if (!list_empty(&dev->power.entry))
+ list_move_tail(&dev->power.entry, &list);
+ put_device(dev);
+ }
+ list_splice(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx);
dpm_show_time(starttime, state, "early");
resume_device_irqs();
@@ -789,20 +802,33 @@ End:
*/
int dpm_suspend_noirq(pm_message_t state)
{
- struct device *dev;
+ struct list_head list;
ktime_t starttime = ktime_get();
int error = 0;
+ INIT_LIST_HEAD(&list);
suspend_device_irqs();
mutex_lock(&dpm_list_mtx);
- list_for_each_entry_reverse(dev, &dpm_list, power.entry) {
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.prev);
+
+ get_device(dev);
+ mutex_unlock(&dpm_list_mtx);
+
error = device_suspend_noirq(dev, state);
+
+ mutex_lock(&dpm_list_mtx);
if (error) {
pm_dev_err(dev, state, " late", error);
+ put_device(dev);
break;
}
dev->power.status = DPM_OFF_IRQ;
+ if (!list_empty(&dev->power.entry))
+ list_move(&dev->power.entry, &list);
+ put_device(dev);
}
+ list_splice_tail(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx);
if (error)
dpm_resume_noirq(resume_event(state));