From: Shirish Pargaonkar <spargaon...@suse.com>
Release blkg infrastructure only after last policy is deactivated
(i.e. let blkg_destroy_all() be called only from blkcg_deactivate_policy())
Otherwise, module can oops because root_blkg gets assigned NULL during
cleanup and we attempt draining the service queues via root_blkg afterwords.
Signed-off-by: Shirish Pargaonkar <spargaon...@suse.com>
Reported-and-tested-by: Sachin Sant <ss...@in.ibm.com>
---
block/blk-cgroup.c | 15 ---------------
block/blk-sysfs.c | 2 +-
2 files changed, 1 insertion(+), 16 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 069bc20..3920de6 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -878,21 +878,6 @@ void blkcg_drain_queue(struct request_queue *q)
blk_throtl_drain(q);
}
-/**
- * blkcg_exit_queue - exit and release blkcg part of request_queue
- * @q: request_queue being released
- *
- * Called from blk_release_queue(). Responsible for exiting blkcg part.
- */
-void blkcg_exit_queue(struct request_queue *q)
-{
- spin_lock_irq(q->queue_lock);
- blkg_destroy_all(q);
- spin_unlock_irq(q->queue_lock);
-
- blk_throtl_exit(q);
-}
-
/*
* We cannot support shared io contexts, as we have no mean to support
* two tasks with the same ioc in two different groups without major rework
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 23321fb..ee24cd2 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -503,7 +503,7 @@ static void blk_release_queue(struct kobject *kobj)
blk_sync_queue(q);
- blkcg_exit_queue(q);
+ blk_throtl_exit(q);
if (q->elevator) {
spin_lock_irq(q->queue_lock);
--
1.8.3.2
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