5045 use atomic_{inc,dec}_* instead of atomic_add_*

@@ -89,11 +89,11 @@
         avl_index_t where;
 
         mr = avl_find(root, &key, &where);
         if ((mr == NULL) && (insert != NULL)) {
                 avl_insert(root, (void *)insert, where);
-                atomic_add_32(&insert->r_refcount, 1);
+                atomic_inc_32(&insert->r_refcount);
                 return (NULL);
         }
 
         return (mr);
 }

@@ -252,11 +252,11 @@
         mutex_exit(&rs->rs_rdma_lock);
 
         ASSERT(!(found && found != mr));
 
         if (mr_ret) {
-                atomic_add_32(&mr->r_refcount, 1);
+                atomic_inc_32(&mr->r_refcount);
                 *mr_ret = mr;
         }
 
         ret = 0;
 out:

@@ -397,11 +397,11 @@
         if (mr->r_use_once || force) {
                 avl_remove(&rs->rs_rdma_keys, &mr->r_rb_node);
                 RB_CLEAR_NODE(&mr->r_rb_node);
                 zot_me = 1;
         } else {
-                atomic_add_32(&mr->r_refcount, 1);
+                atomic_inc_32(&mr->r_refcount);
         }
         mutex_exit(&rs->rs_rdma_lock);
 
         /*
          * May have to issue a dma_sync on this memory region.

@@ -636,11 +636,11 @@
         mutex_enter(&rs->rs_rdma_lock);
         mr = rdsv3_mr_tree_walk(&rs->rs_rdma_keys, r_key, NULL);
         if (!mr)
                 err = -EINVAL;  /* invalid r_key */
         else
-                atomic_add_32(&mr->r_refcount, 1);
+                atomic_inc_32(&mr->r_refcount);
         mutex_exit(&rs->rs_rdma_lock);
 
         if (mr) {
                 mr->r_trans->sync_mr(mr->r_trans_private, DMA_TO_DEVICE);
                 rm->m_rdma_mr = mr;