From ba0718a6d67130fd4bff664b86d2aa63fa49e241 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 16 Nov 2022 08:14:46 +0100 Subject: [PATCH] nvme: don't call blk_mq_{,un}quiesce_tagset when ctrl->tagset is NULL The NVMe drivers support a mode where no tagset is allocated for the I/O queues and only the admin queue is usable. In that case ctrl->tagset is NULL and we must not call the block per-tagset quiesce helpers that dereference it. Fixes: 98d81f0df70c ("nvme: use blk_mq_[un]quiesce_tagset") Reported-by: Gerd Bayer Reported-by: Chao Leng Signed-off-by: Christoph Hellwig Reviewed-by: Chao Leng --- drivers/nvme/host/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 3195ae1..fd2e26c 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -5215,6 +5215,8 @@ EXPORT_SYMBOL_GPL(nvme_start_freeze); void nvme_quiesce_io_queues(struct nvme_ctrl *ctrl) { + if (!ctrl->tagset) + return; if (!test_and_set_bit(NVME_CTRL_STOPPED, &ctrl->flags)) blk_mq_quiesce_tagset(ctrl->tagset); else @@ -5224,6 +5226,8 @@ EXPORT_SYMBOL_GPL(nvme_quiesce_io_queues); void nvme_unquiesce_io_queues(struct nvme_ctrl *ctrl) { + if (!ctrl->tagset) + return; if (test_and_clear_bit(NVME_CTRL_STOPPED, &ctrl->flags)) blk_mq_unquiesce_tagset(ctrl->tagset); } -- 2.7.4