RE: [PATCH 2/6] idr: remove MAX_IDR_MASK and move left MAX_IDR_* into idr.c

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> * drivers/infiniband/core/cm.c:cm_alloc_id()
>   drivers/infiniband/hw/mlx4/cm.c:id_map_alloc()
> 
>   Used to wrap cyclic @start.  Can be replaced with max(next, 0).
>   Note that this type of cyclic allocation using idr is buggy.  These
>   are prone to spurious -ENOSPC failure after the first wraparound.

The replacement code looks fine, but can you explain why the use is buggy?
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