PM: wakelock: Abort task freezing if a wake lock is held.

Avoids a problem where the device sometimes hangs for 20 seconds
before the screen is turned on.

1 files changed, 18 insertions, 6 deletions

diff --git a/kernel/power/process.c b/kernel/power/process.c
index 028a99598f49..48df784fcb7c 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -16,6 +16,7 @@
 #include <linux/freezer.h>
 #include <linux/delay.h>
 #include <linux/workqueue.h>
+#include <linux/wakelock.h>
 
 /* 
  * Timeout for stopping processes
@@ -40,6 +41,7 @@ static int try_to_freeze_tasks(bool sig_only)
 	struct timeval start, end;
 	u64 elapsed_csecs64;
 	unsigned int elapsed_csecs;
+	unsigned int wakeup = 0;
 
 	do_gettimeofday(&start);
 
@@ -75,6 +77,10 @@ static int try_to_freeze_tasks(bool sig_only)
 			todo += wq_busy;
 		}
 
+		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
+			wakeup = 1;
+			break;
+		}
 		if (!todo || time_after(jiffies, end_time))
 			break;
 
@@ -96,12 +102,18 @@ static int try_to_freeze_tasks(bool sig_only)
 		 * and caller must call thaw_processes() if something fails),
 		 * but it cleans up leftover PF_FREEZE requests.
 		 */
-		printk("\n");
-		printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
-		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
-		       elapsed_csecs / 100, elapsed_csecs % 100,
-		       todo - wq_busy, wq_busy);
-
+		if(wakeup) {
+			printk("\n");
+			printk(KERN_ERR "Freezing of %s aborted\n",
+					sig_only ? "user space " : "tasks ");
+		}
+		else {
+			printk("\n");
+			printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
+			       "(%d tasks refusing to freeze, wq_busy=%d):\n",
+			       elapsed_csecs / 100, elapsed_csecs % 100,
+			       todo - wq_busy, wq_busy);
+		}
 		thaw_workqueues();
 
 		read_lock(&tasklist_lock);