1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_keys.c b/drivers/infiniband/hw/ipath/ipath_keys.c
index 46773c673a1a..a5ca279370aa 100644
--- a/drivers/infiniband/hw/ipath/ipath_keys.c
+++ b/drivers/infiniband/hw/ipath/ipath_keys.c
@@ -197,6 +197,21 @@ int ipath_rkey_ok(struct ipath_ibdev *dev, struct ipath_sge_state *ss,
         size_t off;
         int ret;
 
+        /*
+         * We use RKEY == zero for physical addresses
+         * (see ipath_get_dma_mr).
+         */
+        if (rkey == 0) {
+                sge->mr = NULL;
+                sge->vaddr = phys_to_virt(vaddr);
+                sge->length = len;
+                sge->sge_length = len;
+                ss->sg_list = NULL;
+                ss->num_sge = 1;
+                ret = 1;
+                goto bail;
+        }
+
         mr = rkt->table[(rkey >> (32 - ib_ipath_lkey_table_size))];
         if (unlikely(mr == NULL || mr->lkey != rkey)) {
                 ret = 0;