diff options
| -rw-r--r-- | block/blk-mq.c | 34 |
1 files changed, 13 insertions, 21 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 849479debac3..691959ecb80f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1473,22 +1473,6 @@ static int blk_mq_hctx_cpu_offline(struct blk_mq_hw_ctx *hctx, int cpu) return NOTIFY_OK; } -static int blk_mq_hctx_cpu_online(struct blk_mq_hw_ctx *hctx, int cpu) -{ - struct request_queue *q = hctx->queue; - struct blk_mq_tag_set *set = q->tag_set; - - if (set->tags[hctx->queue_num]) - return NOTIFY_OK; - - set->tags[hctx->queue_num] = blk_mq_init_rq_map(set, hctx->queue_num); - if (!set->tags[hctx->queue_num]) - return NOTIFY_STOP; - - hctx->tags = set->tags[hctx->queue_num]; - return NOTIFY_OK; -} - static int blk_mq_hctx_notify(void *data, unsigned long action, unsigned int cpu) { @@ -1496,8 +1480,11 @@ static int blk_mq_hctx_notify(void *data, unsigned long action, if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) return blk_mq_hctx_cpu_offline(hctx, cpu); - else if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) - return blk_mq_hctx_cpu_online(hctx, cpu); + + /* + * In case of CPU online, tags may be reallocated + * in blk_mq_map_swqueue() after mapping is updated. + */ return NOTIFY_OK; } @@ -1682,6 +1669,7 @@ static void blk_mq_map_swqueue(struct request_queue *q) unsigned int i; struct blk_mq_hw_ctx *hctx; struct blk_mq_ctx *ctx; + struct blk_mq_tag_set *set = q->tag_set; queue_for_each_hw_ctx(q, hctx, i) { cpumask_clear(hctx->cpumask); @@ -1708,16 +1696,20 @@ static void blk_mq_map_swqueue(struct request_queue *q) * disable it and free the request entries. */ if (!hctx->nr_ctx) { - struct blk_mq_tag_set *set = q->tag_set; - if (set->tags[i]) { blk_mq_free_rq_map(set, set->tags[i], i); set->tags[i] = NULL; - hctx->tags = NULL; } + hctx->tags = NULL; continue; } + /* unmapped hw queue can be remapped after CPU topo changed */ + if (!set->tags[i]) + set->tags[i] = blk_mq_init_rq_map(set, i); + hctx->tags = set->tags[i]; + WARN_ON(!hctx->tags); + /* * Initialize batch roundrobin counts */ |