diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 1c66c319325c..dd21051fb251 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2622,9 +2622,27 @@ static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) static int blk_mq_update_queue_map(struct blk_mq_tag_set *set) { - if (set->ops->map_queues) + if (set->ops->map_queues) { + int cpu; + /* + * transport .map_queues is usually done in the following + * way: + * + * for (queue = 0; queue < set->nr_hw_queues; queue++) { + * mask = get_cpu_mask(queue) + * for_each_cpu(cpu, mask) + * set->mq_map[cpu] = queue; + * } + * + * When we need to remap, the table has to be cleared for + * killing stale mapping since one CPU may not be mapped + * to any hw queue. + */ + for_each_possible_cpu(cpu) + set->mq_map[cpu] = 0; + return set->ops->map_queues(set); - else + } else return blk_mq_map_queues(set); } |