Hi,
The suspend/hibernation is broken on SMP due to:
commit 3540af8ffddcdbc7573451ac0b5cd57a2eaf8af5
tifm: replace per-adapter kthread with freezeable workqueue
Well, it looks like freezable worqueues still deadlock with CPU hotplug
when worker threads are frozen.
The appended patch fixes the issue, but I think we could even avoid the
killing of frozen worker threads.
Greetings,
Rafael
---
Prevent freezable worqueues from deadlocking with CPU hotplug during a
suspend/hibernation by thawing their worker threads before they get stopped.
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
kernel/workqueue.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
Index: linux-2.6.22-rc1/kernel/workqueue.c
===================================================================
--- linux-2.6.22-rc1.orig/kernel/workqueue.c
+++ linux-2.6.22-rc1/kernel/workqueue.c
@@ -799,9 +799,7 @@ static int __devinit workqueue_cpu_callb
struct cpu_workqueue_struct *cwq;
struct workqueue_struct *wq;
- action &= ~CPU_TASKS_FROZEN;
-
- switch (action) {
+ switch (action & ~CPU_TASKS_FROZEN) {
case CPU_LOCK_ACQUIRE:
mutex_lock(&workqueue_mutex);
return NOTIFY_OK;
@@ -819,20 +817,29 @@ static int __devinit workqueue_cpu_callb
switch (action) {
case CPU_UP_PREPARE:
+ case CPU_UP_PREPARE_FROZEN:
if (!create_workqueue_thread(cwq, cpu))
break;
printk(KERN_ERR "workqueue for %i failed\n", cpu);
return NOTIFY_BAD;
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
start_workqueue_thread(cwq, cpu);
break;
case CPU_UP_CANCELED:
+ case CPU_UP_CANCELED_FROZEN:
start_workqueue_thread(cwq, -1);
case CPU_DEAD:
cleanup_workqueue_thread(cwq, cpu);
break;
+
+ case CPU_DEAD_FROZEN:
+ if (wq->freezeable)
+ thaw_process(cwq->thread);
+ cleanup_workqueue_thread(cwq, cpu);
+ break;
}
}
-
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