IB/srp: Initialize dma_length in srp_map_idb

Without this sg_dma_len will return 0 on architectures tha have
the dma_length field.

Fixes: commit f7f7aab1a5c0 ("IB/srp: Convert to new registration API")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index c7a95d2dc164..72fac204d756 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1524,6 +1524,9 @@ static int srp_map_idb(struct srp_rdma_ch *ch, struct srp_request *req,
                 state.sg_nents = 1;
                 sg_set_buf(idb_sg, req->indirect_desc, idb_len);
                 idb_sg->dma_address = req->indirect_dma_addr; /* hack! */
+#ifdef CONFIG_NEED_SG_DMA_LENGTH
+                idb_sg->dma_length = idb_sg->length;          /* hack^2 */
+#endif
                 ret = srp_map_finish_fr(&state, ch);
                 if (ret < 0)
                         return ret;