Kernel threads need to be aware of freeze request, by
checking in each loop. xenbus/xenwatch threads are bit
special with PF_NOFREEZE, since we''re sure that they
do nothing to block other native device drivers.
Signed-off-by Ke Yu <ke.yu@intel.com>
Signed-off-by Kevin Tian <kevin.tian@intel.com>
diff -r 26f7f5045ddd linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c
--- a/linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c Tue Apr
10 12:46:03 2007 -0400
+++ b/linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c Tue Apr
10 12:46:34 2007 -0400
@@ -208,6 +208,9 @@ int blkif_schedule(void *arg)
printk(KERN_DEBUG "%s: started\n", current->comm);
while (!kthread_should_stop()) {
+ if(try_to_freeze())
+ continue;
+
wait_event_interruptible(
blkif->wq,
blkif->waiting_reqs || kthread_should_stop());
diff -r 26f7f5045ddd linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_xs.c
--- a/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_xs.c Tue Apr
10 12:46:03 2007 -0400
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_xs.c Tue Apr
10 12:46:34 2007 -0400
@@ -718,6 +718,7 @@ static int xenwatch_thread(void *unused)
struct list_head *ent;
struct xs_stored_msg *msg;
+ current->flags |= PF_NOFREEZE;
for (;;) {
wait_event_interruptible(watch_events_waitq,
!list_empty(&watch_events));
@@ -836,6 +837,7 @@ static int xenbus_thread(void *unused)
{
int err;
+ current->flags |= PF_NOFREEZE;
for (;;) {
err = process_msg();
if (err)
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