[PATCH] nvme-rdma: flush async events before freeing qe

[David Milburn]

Flush async event workqueue in case async event has been
queued up before freeing qe and setting ctrl->async_event_sqe.data
to NULL. Otherwise, we can get into a state were nvme_rdma_submit_
async_event() runs with sqe->data set to NULL leading to crash.

Signed-off-by: David Milburn <dmilburn at redhat.com>
---
 drivers/nvme/host/rdma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 8e5ffe2f117d..76f117462d5b 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -835,6 +835,7 @@ static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
 		blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
 	}
 	if (ctrl->async_event_sqe.data) {
+		flush_work(&ctrl->ctrl.async_event_work);
 		nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
 				sizeof(struct nvme_command), DMA_TO_DEVICE);
 		ctrl->async_event_sqe.data = NULL;
-- 
2.18.1