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-rw-r--r--block/blk-mq.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2864e191cc86..28bf667bfe09 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -944,6 +944,26 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async)
}
EXPORT_SYMBOL(blk_mq_run_hw_queues);
+/**
+ * blk_mq_queue_stopped() - check whether one or more hctxs have been stopped
+ * @q: request queue.
+ *
+ * The caller is responsible for serializing this function against
+ * blk_mq_{start,stop}_hw_queue().
+ */
+bool blk_mq_queue_stopped(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
+ queue_for_each_hw_ctx(q, hctx, i)
+ if (blk_mq_hctx_stopped(hctx))
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL(blk_mq_queue_stopped);
+
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx)
{
cancel_work(&hctx->run_work);