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-rw-r--r--block/blk-mq.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index a5dbd069c9da..31c0c6259c4c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1797,6 +1797,11 @@ static void blk_mq_map_swqueue(struct request_queue *q,
struct blk_mq_ctx *ctx;
struct blk_mq_tag_set *set = q->tag_set;
+ /*
+ * Avoid others reading imcomplete hctx->cpumask through sysfs
+ */
+ mutex_lock(&q->sysfs_lock);
+
queue_for_each_hw_ctx(q, hctx, i) {
cpumask_clear(hctx->cpumask);
hctx->nr_ctx = 0;
@@ -1816,6 +1821,8 @@ static void blk_mq_map_swqueue(struct request_queue *q,
hctx->ctxs[hctx->nr_ctx++] = ctx;
}
+ mutex_unlock(&q->sysfs_lock);
+
queue_for_each_hw_ctx(q, hctx, i) {
struct blk_mq_ctxmap *map = &hctx->ctx_map;