IB/mlx4: convert to idr_alloc()
[~shefty/rdma-dev.git] / drivers / infiniband / hw / mlx4 / cm.c
index dbc99d41605cf5aeba7c883bec270b053fdea3da..80e59ed864b38a62bf749ab3d33889ad83e496ed 100644 (file)
@@ -203,7 +203,7 @@ static void sl_id_map_add(struct ib_device *ibdev, struct id_map_entry *new)
 static struct id_map_entry *
 id_map_alloc(struct ib_device *ibdev, int slave_id, u32 sl_cm_id)
 {
-       int ret, id;
+       int ret;
        static int next_id;
        struct id_map_entry *ent;
        struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
@@ -220,25 +220,23 @@ id_map_alloc(struct ib_device *ibdev, int slave_id, u32 sl_cm_id)
        ent->dev = to_mdev(ibdev);
        INIT_DELAYED_WORK(&ent->timeout, id_map_ent_timeout);
 
-       do {
-               spin_lock(&to_mdev(ibdev)->sriov.id_map_lock);
-               ret = idr_get_new_above(&sriov->pv_id_table, ent,
-                                       next_id, &id);
-               if (!ret) {
-                       next_id = ((unsigned) id + 1) & MAX_IDR_MASK;
-                       ent->pv_cm_id = (u32)id;
-                       sl_id_map_add(ibdev, ent);
-               }
+       idr_preload(GFP_KERNEL);
+       spin_lock(&to_mdev(ibdev)->sriov.id_map_lock);
 
-               spin_unlock(&sriov->id_map_lock);
-       } while (ret == -EAGAIN && idr_pre_get(&sriov->pv_id_table, GFP_KERNEL));
-       /*the function idr_get_new_above can return -ENOSPC, so don't insert in that case.*/
-       if (!ret) {
-               spin_lock(&sriov->id_map_lock);
+       ret = idr_alloc(&sriov->pv_id_table, ent, next_id, 0, GFP_NOWAIT);
+       if (ret >= 0) {
+               next_id = ((unsigned)ret + 1) & MAX_IDR_MASK;
+               ent->pv_cm_id = (u32)ret;
+               sl_id_map_add(ibdev, ent);
                list_add_tail(&ent->list, &sriov->cm_list);
-               spin_unlock(&sriov->id_map_lock);
-               return ent;
        }
+
+       spin_unlock(&sriov->id_map_lock);
+       idr_preload_end();
+
+       if (ret >= 0)
+               return ent;
+
        /*error flow*/
        kfree(ent);
        mlx4_ib_warn(ibdev, "No more space in the idr (err:0x%x)\n", ret);