Merge remote-tracking branch 'scsi/for-next'

[karo-tx-linux.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index 0a00e4ecf87cae37a3d310c8dfd32869ac24c161..25f13479f552562bc2e406f3ebed2bf150e93fe9 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -645,10 +645,12 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
        __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags);
 
        if (blkcg_init_queue(q))
-               goto fail_id;
+               goto fail_bdi;
 
        return q;
 
+fail_bdi:
+       bdi_destroy(&q->backing_dev_info);
 fail_id:
        ida_simple_remove(&blk_queue_ida, q->id);
 fail_q:
@@ -739,9 +741,17 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
 
        q->sg_reserved_size = INT_MAX;
 
+       /* Protect q->elevator from elevator_change */
+       mutex_lock(&q->sysfs_lock);
+
        /* init elevator */
-       if (elevator_init(q, NULL))
+       if (elevator_init(q, NULL)) {
+               mutex_unlock(&q->sysfs_lock);
                return NULL;
+       }
+
+       mutex_unlock(&q->sysfs_lock);
+
        return q;
 }
 EXPORT_SYMBOL(blk_init_allocated_queue);
@@ -1419,6 +1429,9 @@ static bool attempt_plug_merge(struct request_queue *q, struct bio *bio,
        struct request *rq;
        bool ret = false;
 
+       if (blk_queue_nomerges(q))
+               goto out;
+
        plug = current->plug;
        if (!plug)
                goto out;
@@ -2227,6 +2240,7 @@ void blk_start_request(struct request *req)
        if (unlikely(blk_bidi_rq(req)))
                req->next_rq->resid_len = blk_rq_bytes(req->next_rq);
 
+       BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
        blk_add_timer(req);
 }
 EXPORT_SYMBOL(blk_start_request);