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-rw-r--r--block/bfq-iosched.c15
-rw-r--r--block/bfq-iosched.h2
-rw-r--r--block/bfq-wf2q.c17
3 files changed, 23 insertions, 11 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index fac188dd78fa..dfb8cb0af13a 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2822,7 +2822,7 @@ static void bfq_dispatch_remove(struct request_queue *q, struct request *rq)
bfq_remove_request(q, rq);
}
-static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq)
+static bool __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq)
{
/*
* If this bfqq is shared between multiple processes, check
@@ -2855,9 +2855,11 @@ static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq)
/*
* All in-service entities must have been properly deactivated
* or requeued before executing the next function, which
- * resets all in-service entites as no more in service.
+ * resets all in-service entities as no more in service. This
+ * may cause bfqq to be freed. If this happens, the next
+ * function returns true.
*/
- __bfq_bfqd_reset_in_service(bfqd);
+ return __bfq_bfqd_reset_in_service(bfqd);
}
/**
@@ -3262,7 +3264,6 @@ void bfq_bfqq_expire(struct bfq_data *bfqd,
bool slow;
unsigned long delta = 0;
struct bfq_entity *entity = &bfqq->entity;
- int ref;
/*
* Check whether the process is slow (see bfq_bfqq_is_slow).
@@ -3347,10 +3348,8 @@ void bfq_bfqq_expire(struct bfq_data *bfqd,
* reason.
*/
__bfq_bfqq_recalc_budget(bfqd, bfqq, reason);
- ref = bfqq->ref;
- __bfq_bfqq_expire(bfqd, bfqq);
-
- if (ref == 1) /* bfqq is gone, no more actions on it */
+ if (__bfq_bfqq_expire(bfqd, bfqq))
+ /* bfqq is gone, no more actions on it */
return;
bfqq->injected_service = 0;
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 062e1c4787f4..86394e503ca9 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -995,7 +995,7 @@ bool __bfq_deactivate_entity(struct bfq_entity *entity,
bool ins_into_idle_tree);
bool next_queue_may_preempt(struct bfq_data *bfqd);
struct bfq_queue *bfq_get_next_queue(struct bfq_data *bfqd);
-void __bfq_bfqd_reset_in_service(struct bfq_data *bfqd);
+bool __bfq_bfqd_reset_in_service(struct bfq_data *bfqd);
void bfq_deactivate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,
bool ins_into_idle_tree, bool expiration);
void bfq_activate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq);
diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
index a11bef75483d..ae4d000ac0af 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -1605,7 +1605,8 @@ struct bfq_queue *bfq_get_next_queue(struct bfq_data *bfqd)
return bfqq;
}
-void __bfq_bfqd_reset_in_service(struct bfq_data *bfqd)
+/* returns true if the in-service queue gets freed */
+bool __bfq_bfqd_reset_in_service(struct bfq_data *bfqd)
{
struct bfq_queue *in_serv_bfqq = bfqd->in_service_queue;
struct bfq_entity *in_serv_entity = &in_serv_bfqq->entity;
@@ -1629,8 +1630,20 @@ void __bfq_bfqd_reset_in_service(struct bfq_data *bfqd)
* service tree either, then release the service reference to
* the queue it represents (taken with bfq_get_entity).
*/
- if (!in_serv_entity->on_st)
+ if (!in_serv_entity->on_st) {
+ /*
+ * If no process is referencing in_serv_bfqq any
+ * longer, then the service reference may be the only
+ * reference to the queue. If this is the case, then
+ * bfqq gets freed here.
+ */
+ int ref = in_serv_bfqq->ref;
bfq_put_queue(in_serv_bfqq);
+ if (ref == 1)
+ return true;
+ }
+
+ return false;
}
void bfq_deactivate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,