nvmet-rdma: remove p2p_client initialization from fast-path

Initialize it during command allocation.

Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Stephen Bates <sbates@raithlin.com>
Signed-off-by: NMax Gurtovoy <maxg@mellanox.com>
Reviewed-by: NLogan Gunthorpe <logang@deltatee.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

drivers/nvme/target/rdma.c

@@ -373,6 +373,7 @@ static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
 	if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
 		goto out_free_rsp;
 
+	r->req.p2p_client = &ndev->device->dev;
 	r->send_sge.length = sizeof(*r->req.rsp);
 	r->send_sge.lkey = ndev->pd->local_dma_lkey;
 
@@ -763,8 +764,6 @@ static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
 		cmd->send_sge.addr, cmd->send_sge.length,
 		DMA_TO_DEVICE);
 
-	cmd->req.p2p_client = &queue->dev->device->dev;
-
 	if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
 			&queue->nvme_sq, &nvmet_rdma_ops))
 		return;