nvme-rdma: Check that reinit_request got a proper mr

Warn if req->mr is NULL as it should never happen.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 221ace2..7e61e64 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -274,6 +274,9 @@ static int nvme_rdma_reinit_request(void *data, struct request *rq)
        struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
        int ret = 0;
 
+       if (WARN_ON_ONCE(!req->mr))
+               return 0;
+
        ib_dereg_mr(req->mr);
 
        req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,