libertas: don't retry commands

[mv-sheeva.git] / block / cfq-iosched.c

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 78f4829895bd9417d8d81908b41f0f23c0f1d4bf..cfb0b2f5f63de6d75213b16373f84a248fbd6421 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -287,6 +287,7 @@ struct cfq_data {
 
        /* List of cfq groups being managed on this device*/
        struct hlist_head cfqg_list;
+       struct rcu_head rcu;
 };
 
 static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd);
@@ -2367,7 +2368,7 @@ static int cfq_dispatch_requests(struct request_queue *q, int force)
 static void cfq_put_queue(struct cfq_queue *cfqq)
 {
        struct cfq_data *cfqd = cfqq->cfqd;
-       struct cfq_group *cfqg;
+       struct cfq_group *cfqg, *orig_cfqg;
 
        BUG_ON(atomic_read(&cfqq->ref) <= 0);
 
@@ -2378,6 +2379,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
        BUG_ON(rb_first(&cfqq->sort_list));
        BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]);
        cfqg = cfqq->cfqg;
+       orig_cfqg = cfqq->orig_cfqg;
 
        if (unlikely(cfqd->active_queue == cfqq)) {
                __cfq_slice_expired(cfqd, cfqq, 0);
@@ -2387,8 +2389,8 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
        BUG_ON(cfq_cfqq_on_rr(cfqq));
        kmem_cache_free(cfq_pool, cfqq);
        cfq_put_cfqg(cfqg);
-       if (cfqq->orig_cfqg)
-               cfq_put_cfqg(cfqq->orig_cfqg);
+       if (orig_cfqg)
+               cfq_put_cfqg(orig_cfqg);
 }
 
 /*
@@ -3601,6 +3603,11 @@ static void cfq_put_async_queues(struct cfq_data *cfqd)
                cfq_put_queue(cfqd->async_idle_cfqq);
 }
 
+static void cfq_cfqd_free(struct rcu_head *head)
+{
+       kfree(container_of(head, struct cfq_data, rcu));
+}
+
 static void cfq_exit_queue(struct elevator_queue *e)
 {
        struct cfq_data *cfqd = e->elevator_data;
@@ -3630,8 +3637,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
        cfq_shutdown_timer_wq(cfqd);
 
        /* Wait for cfqg->blkg->key accessors to exit their grace periods. */
-       synchronize_rcu();
-       kfree(cfqd);
+       call_rcu(&cfqd->rcu, cfq_cfqd_free);
 }
 
 static void *cfq_init_queue(struct request_queue *q)
@@ -3706,6 +3712,7 @@ static void *cfq_init_queue(struct request_queue *q)
        cfqd->cfq_group_isolation = 0;
        cfqd->hw_tag = -1;
        cfqd->last_end_sync_rq = jiffies;
+       INIT_RCU_HEAD(&cfqd->rcu);
        return cfqd;
 }