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

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Avoids a problem where the device sometimes hangs for 20 seconds
before the screen is turned on.
This commit is contained in:
Arve Hjønnevåg
2008-10-14 16:02:39 -07:00
committed by Colin Cross
parent 507fedc715
commit 003cfdd042
1 changed files with 18 additions and 6 deletions
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24
kernel/power/process.c
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@@ -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);