From 96135862dfcce38b98beff7d1009188263b7e6f7 Mon Sep 17 00:00:00 2001 From: Israel Rukshin Date: Tue, 24 Mar 2020 17:29:44 +0200 Subject: [PATCH] nvme-rdma: Add warning on state change failure at nvme_rdma_setup_ctrl The transition to LIVE state should not fail in case of a new controller. Moving to DELETING state before nvme_tcp_create_ctrl() allocates all the resources may leads to NULL dereference at teardown flow (e.g., IO tagset, admin_q, connect_q). Signed-off-by: Israel Rukshin Reviewed-by: Max Gurtovoy Reviewed-by: Christoph Hellwig Signed-off-by: Keith Busch --- drivers/nvme/host/rdma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index c99a88247660..3ae3011a95ea 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1022,8 +1022,13 @@ static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new) changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); if (!changed) { - /* state change failure is ok if we're in DELETING state */ + /* + * state change failure is ok if we're in DELETING state, + * unless we're during creation of a new controller to + * avoid races with teardown flow. + */ WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING); + WARN_ON_ONCE(new); ret = -EINVAL; goto destroy_io; }