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authorRafael J. Wysocki <rjw@sisk.pl>2011-01-31 13:06:50 +0300
committerRafael J. Wysocki <rjw@sisk.pl>2011-03-15 02:43:13 +0300
commit378eef99ad45700aabfba2bd962516e5608b259a (patch)
treed9a0d584495e5b6ee764b6d740cece46f3b5ed1d /drivers/base
parent023d3779145ec6b7a0f38f19672a347b92feb74e (diff)
downloadlinux-378eef99ad45700aabfba2bd962516e5608b259a.tar.xz
PM / Wakeup: Make pm_save_wakeup_count() work as documented
According to Documentation/ABI/testing/sysfs-power, the /sys/power/wakeup_count interface should only make the kernel react to wakeup events during suspend if the last write to it has been successful. However, if /sys/power/wakeup_count is written to two times in a row, where the first write is successful and the second is not, the kernel will still react to wakeup events during suspend due to a bug in pm_save_wakeup_count(). Fix the bug by making pm_save_wakeup_count() clear events_check_enabled unconditionally before checking if there are any new wakeup events registered since the previous read from /sys/power/wakeup_count. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/wakeup.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index e5e73b5efc80..07e08c3aece4 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -616,25 +616,25 @@ bool pm_get_wakeup_count(unsigned int *count)
*
* If @count is equal to the current number of registered wakeup events and the
* current number of wakeup events being processed is zero, store @count as the
- * old number of registered wakeup events to be used by pm_check_wakeup_events()
- * and return true. Otherwise return false.
+ * old number of registered wakeup events for pm_check_wakeup_events(), enable
+ * wakeup events detection and return 'true'. Otherwise disable wakeup events
+ * detection and return 'false'.
*/
bool pm_save_wakeup_count(unsigned int count)
{
unsigned int cnt, inpr;
- bool ret = false;
+ events_check_enabled = false;
spin_lock_irq(&events_lock);
split_counters(&cnt, &inpr);
if (cnt == count && inpr == 0) {
saved_count = count;
events_check_enabled = true;
- ret = true;
}
spin_unlock_irq(&events_lock);
- if (!ret)
+ if (!events_check_enabled)
pm_wakeup_update_hit_counts();
- return ret;
+ return events_check_enabled;
}
static struct dentry *wakeup_sources_stats_dentry;