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-rw-r--r--block/cfq-iosched.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 7102bafc98b3..3cd985bece3a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -91,6 +91,9 @@ static kmem_cache_t *crq_pool;
static kmem_cache_t *cfq_pool;
static kmem_cache_t *cfq_ioc_pool;
+static atomic_t ioc_count = ATOMIC_INIT(0);
+static struct completion *ioc_gone;
+
#define CFQ_PRIO_LISTS IOPRIO_BE_NR
#define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE)
#define cfq_class_be(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_BE)
@@ -1202,13 +1205,17 @@ static void cfq_free_io_context(struct cfq_io_context *cic)
{
struct cfq_io_context *__cic;
struct list_head *entry, *next;
+ int freed = 1;
list_for_each_safe(entry, next, &cic->list) {
__cic = list_entry(entry, struct cfq_io_context, list);
kmem_cache_free(cfq_ioc_pool, __cic);
+ freed++;
}
kmem_cache_free(cfq_ioc_pool, cic);
+ if (atomic_sub_and_test(freed, &ioc_count) && ioc_gone)
+ complete(ioc_gone);
}
static void cfq_trim(struct io_context *ioc)
@@ -1297,6 +1304,7 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
cic->dtor = cfq_free_io_context;
cic->exit = cfq_exit_io_context;
INIT_LIST_HEAD(&cic->queue_list);
+ atomic_inc(&ioc_count);
}
return cic;
@@ -1501,6 +1509,7 @@ restart:
list);
read_unlock(&cfq_exit_lock);
kmem_cache_free(cfq_ioc_pool, cic);
+ atomic_dec(&ioc_count);
goto restart;
}
@@ -1523,6 +1532,7 @@ restart:
list_del(&__cic->list);
read_unlock(&cfq_exit_lock);
kmem_cache_free(cfq_ioc_pool, __cic);
+ atomic_dec(&ioc_count);
goto restart;
}
}
@@ -2510,7 +2520,13 @@ static int __init cfq_init(void)
static void __exit cfq_exit(void)
{
+ DECLARE_COMPLETION(all_gone);
elv_unregister(&iosched_cfq);
+ ioc_gone = &all_gone;
+ barrier();
+ if (atomic_read(&ioc_count))
+ complete(ioc_gone);
+ synchronize_rcu();
cfq_slab_kill();
}