virt: Convert kvm hotplug to state machine

[cascardo/linux.git] / block / blk-mq.c

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 1699baf..f9b9049 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1122,8 +1122,7 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio)
 {
        init_request_from_bio(rq, bio);
 
-       if (blk_do_io_stat(rq))
-               blk_account_io_start(rq, 1);
+       blk_account_io_start(rq, 1);
 }
 
 static inline bool hctx_allow_merges(struct blk_mq_hw_ctx *hctx)
@@ -1263,12 +1262,9 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
 
        blk_queue_split(q, &bio, q->bio_split);
 
-       if (!is_flush_fua && !blk_queue_nomerges(q)) {
-               if (blk_attempt_plug_merge(q, bio, &request_count,
-                                          &same_queue_rq))
-                       return BLK_QC_T_NONE;
-       } else
-               request_count = blk_plug_queued_count(q);
+       if (!is_flush_fua && !blk_queue_nomerges(q) &&
+           blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq))
+               return BLK_QC_T_NONE;
 
        rq = blk_mq_map_request(q, bio, &data);
        if (unlikely(!rq))
@@ -1359,9 +1355,11 @@ static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio)
 
        blk_queue_split(q, &bio, q->bio_split);
 
-       if (!is_flush_fua && !blk_queue_nomerges(q) &&
-           blk_attempt_plug_merge(q, bio, &request_count, NULL))
-               return BLK_QC_T_NONE;
+       if (!is_flush_fua && !blk_queue_nomerges(q)) {
+               if (blk_attempt_plug_merge(q, bio, &request_count, NULL))
+                       return BLK_QC_T_NONE;
+       } else
+               request_count = blk_plug_queued_count(q);
 
        rq = blk_mq_map_request(q, bio, &data);
        if (unlikely(!rq))
@@ -1496,7 +1494,7 @@ static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
                int to_do;
                void *p;
 
-               while (left < order_to_size(this_order - 1) && this_order)
+               while (this_order && left < order_to_size(this_order - 1))
                        this_order--;
 
                do {
@@ -2021,7 +2019,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
 
        q->queue_ctx = alloc_percpu(struct blk_mq_ctx);
        if (!q->queue_ctx)
-               return ERR_PTR(-ENOMEM);
+               goto err_exit;
 
        q->queue_hw_ctx = kzalloc_node(nr_cpu_ids * sizeof(*(q->queue_hw_ctx)),
                                                GFP_KERNEL, set->numa_node);
@@ -2085,6 +2083,8 @@ err_map:
        kfree(q->queue_hw_ctx);
 err_percpu:
        free_percpu(q->queue_ctx);
+err_exit:
+       q->mq_ops = NULL;
        return ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL(blk_mq_init_allocated_queue);