RE: [PATCH v3 for-next 13/13] RDMA/rdmavt: Use refcount_t instead of atomic_t on refcount of rvt_mcast

["Marciniszyn, Mike" <mike.marciniszyn@xxxxxxxxxxxxxxxxxxxx>]

> +++ b/drivers/infiniband/hw/hfi1/verbs.c
> @@ -534,7 +534,8 @@ static inline void hfi1_handle_packet(struct
> hfi1_packet *packet,
>  		 * Notify rvt_multicast_detach() if it is waiting for us
>  		 * to finish.
>  		 */
> -		if (atomic_dec_return(&mcast->refcount) <= 1)
> +		refcount_dec(&mcast->refcount);
> +		if (refcount_read(&mcast->refcount) <= 1)
>  			wake_up(&mcast->wait);

Is there refcount_ that preserves the atomic characteristics of the single call?

Mike