linux-kernel - [PATCH 3/3] PM / Wakeup: Don't update events_check_enabled in pm_get_wakeup

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Date:	Tue, 25 Jan 2011 01:16:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH 3/3] PM / Wakeup: Don't update events_check_enabled in pm_get_wakeup_count()

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

Since pm_save_wakeup_count() has just been changed to clear
events_check_enabled unconditionally before checking if there are
any new wakeup events registered since the last read from
/sys/power/wakeup_count, the detection of wakeup events during
suspend may be disabled, after it's been enabled, by writing a
"wrong" value back to /sys/power/wakeup_count.  For this reason,
it is not necessary to update events_check_enabled in
pm_get_wakeup_count() any more.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/base/power/wakeup.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

Index: linux-2.6/drivers/base/power/wakeup.c
===================================================================
--- linux-2.6.orig/drivers/base/power/wakeup.c
+++ linux-2.6/drivers/base/power/wakeup.c
@@ -616,17 +616,14 @@ bool pm_wakeup_pending(void)
  * Store the number of registered wakeup events at the address in @count.  Block
  * if the current number of wakeup events being processed is nonzero.
  *
- * Return false if the wait for the number of wakeup events being processed to
+ * Return 'false' if the wait for the number of wakeup events being processed to
  * drop down to zero has been interrupted by a signal (and the current number
- * of wakeup events being processed is still nonzero).  Otherwise return true.
+ * of wakeup events being processed is still nonzero).  Otherwise return 'true'.
  */
 bool pm_get_wakeup_count(unsigned int *count)
 {
 	bool ret;
 
-	if (capable(CAP_SYS_ADMIN))
-		events_check_enabled = false;
-
 	while (atomic_read(&events_in_progress) && !signal_pending(current)) {
 		pm_wakeup_update_hit_counts();
 		schedule_timeout_interruptible(msecs_to_jiffies(TIMEOUT));

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