[PATCH] PM: Prevent dpm_prepare() from returning errors unnecessarily

Rafael J. Wysocki
2010-11-28T12:13:58Z

From: Rafael J. Wysocki <rjw@sisk.pl>

Currently dpm_prepare() returns error code if it finds that a device
being suspended has a pending runtime resume request. However, it
should not do that if the checking for wakeup events is not enabled.
On the other hand, if the checking for wakeup events is enabled, it
can return error when a wakeup event is detected, regardless of its
source.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/base/power/main.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ linux-2.6/drivers/base/power/main.c
@@ -26,6 +26,7 @@
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/async.h>
+#include <linux/suspend.h>

#include "../base.h"
#include "power.h"
@@ -1052,8 +1053,10 @@ static int dpm_prepare(pm_message_t stat
mutex_unlock(&dpm_list_mtx);

pm_runtime_get_noresume(dev);
- if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
- /* Wake-up requested during system sleep transition. */
+ if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
+ pm_wakeup_event(dev, 0);
+
+ if (pm_check_wakeup_events()) {
pm_runtime_put_sync(dev);
error = -EBUSY;
} else {
@@ -1068,8 +1071,8 @@ static int dpm_prepare(pm_message_t stat
error = 0;
continue;
}
- printk(KERN_ERR "PM: Failed to prepare device %s "
- "for power transition: error %d\n",
+ printk(KERN_INFO "PM: Device %s not prepared "
+ "for power transition: code %d\n",
kobject_name(&dev->kobj), error);
put_device(dev);
break;