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authorhuhai <huhai@kylinos.cn>2018-05-18 08:32:30 -0600
committerJens Axboe <axboe@kernel.dk>2018-05-18 08:35:38 -0600
commitd416c92c5d6229b33f37f0f75e52194081ccbcc4 (patch)
treedbc881f131ae6981d736023cf1ba9fc59e292ed5 /block/blk-mq.c
parent76aa1d341257c1beb6ecfdd67fecdaac7e2aee25 (diff)
downloadlinux-d416c92c5d6229b33f37f0f75e52194081ccbcc4.tar.bz2
blk-mq: clear hctx->dispatch_from when mappings change
When the number of hardware queues is changed, the drivers will call blk_mq_update_nr_hw_queues() to remap hardware queues. This changes the ctx mappings, but the current code doesn't clear the ->dispatch_from hint. This can result in dispatch_from pointing to a ctx that isn't mapped to the hctx anymore. Fixes: b347689ffbca ("blk-mq-sched: improve dispatching from sw queue") Signed-off-by: huhai <huhai@kylinos.cn> Reviewed-by: Ming Lei <ming.lei@redhat.com> Moved the placement of the clearing to where we clear other items pertaining to the existing mapping, added Fixes line, and reworded the commit message. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6c6aef44badd..4cbfd784e837 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2358,6 +2358,7 @@ static void blk_mq_map_swqueue(struct request_queue *q)
queue_for_each_hw_ctx(q, hctx, i) {
cpumask_clear(hctx->cpumask);
hctx->nr_ctx = 0;
+ hctx->dispatch_from = NULL;
}
/*