cfq-iosched: properly protect ioc_gone and ioc count

If we have multiple tasks freeing cfq_io_contexts when cfq-iosched
is being unloaded, we could complete() ioc_gone twice. Fix that by
protecting ioc_gone complete() and clearing with a spinlock for
just that purpose. Doesn't matter from a performance perspective,
since it'll only enter that path when ioc_gone != NULL (when cfq-iosched
is being rmmod'ed).

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d01b411..32aa367 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -48,6 +48,7 @@ static struct kmem_cache *cfq_ioc_pool;
 
 static DEFINE_PER_CPU(unsigned long, ioc_count);
 static struct completion *ioc_gone;
+static DEFINE_SPINLOCK(ioc_gone_lock);
 
 #define CFQ_PRIO_LISTS         IOPRIO_BE_NR
 #define cfq_class_idle(cfqq)   ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE)
@@ -1177,8 +1178,19 @@ static void cfq_cic_free_rcu(struct rcu_head *head)
        kmem_cache_free(cfq_ioc_pool, cic);
        elv_ioc_count_dec(ioc_count);
 
-       if (ioc_gone && !elv_ioc_count_read(ioc_count))
-               complete(ioc_gone);
+       if (ioc_gone) {
+               /*
+                * CFQ scheduler is exiting, grab exit lock and check
+                * the pending io context count. If it hits zero,
+                * complete ioc_gone and set it back to NULL
+                */
+               spin_lock(&ioc_gone_lock);
+               if (ioc_gone && !elv_ioc_count_read(ioc_count)) {
+                       complete(ioc_gone);
+                       ioc_gone = NULL;
+               }
+               spin_unlock(&ioc_gone_lock);
+       }
 }
 
 static void cfq_cic_free(struct cfq_io_context *cic)
@@ -2317,7 +2329,7 @@ static void __exit cfq_exit(void)
         * pending RCU callbacks
         */
        if (elv_ioc_count_read(ioc_count))
-               wait_for_completion(ioc_gone);
+               wait_for_completion(&all_gone);
        cfq_slab_kill();
 }