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 <[email protected]>
Signed-off-by: Sagi Grimberg <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 221ace23aaa5e2386375f8ec8d18d71d975af34a..7e61e6447d2cc45b6f76d09c57360585895f5089 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,