[PATCH 1/1]: Thaws refrigerated bdi flusher threads before invoking kthread_stop on them

Romit Dasgupta
2009-11-11T08:30:16Z

Kicks out frozen bdi flusher task out of the refrigerator when the flusher task
needs to exit.
Signed-off-by: Romit Dasgupta <romit@ti.com>
---
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 5a37e20..c757b05 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -606,8 +606,11 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
* Finally, kill the kernel threads. We don't need to be RCU
* safe anymore, since the bdi is gone from visibility.
*/
- list_for_each_entry(wb, &bdi->wb_list, list)
+ list_for_each_entry(wb, &bdi->wb_list, list) {
+ if (unlikely(frozen(wb->task)))
+ wb->task->flags &= ~PF_FROZEN;
kthread_stop(wb->task);
+ }
}

void bdi_unregister(struct backing_dev_info *bdi)