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SubjectRe: [PATCH 60/62] sctp: convert to idr_alloc()
On 02/02/2013 08:21 PM, Tejun Heo wrote:
> Convert to the much saner new idr interface.
>
> Only compile tested.
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Vlad Yasevich <vyasevich@gmail.com>
> Cc: Sridhar Samudrala <sri@us.ibm.com>
> Cc: Neil Horman <nhorman@tuxdriver.com>
> Cc: linux-sctp@vger.kernel.org
> ---
> This patch depends on an earlier idr changes and I think it would be
> best to route these together through -mm. Please holler if there's
> any objection. Thanks.
>
> net/sctp/associola.c | 27 +++++++++++----------------
> 1 file changed, 11 insertions(+), 16 deletions(-)
>
> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> index b45ed1f..a9962e4 100644
> --- a/net/sctp/associola.c
> +++ b/net/sctp/associola.c
> @@ -1592,32 +1592,27 @@ int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
> /* Set an association id for a given association */
> int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp)
> {
> - int assoc_id;
> - int error = 0;
> + int ret;
>
> /* If the id is already assigned, keep it. */
> if (asoc->assoc_id)
> - return error;
> -retry:
> - if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp)))
> - return -ENOMEM;
> + return 0;
>
> + idr_preload(gfp);
> spin_lock_bh(&sctp_assocs_id_lock);
> - error = idr_get_new_above(&sctp_assocs_id, (void *)asoc,
> - idr_low, &assoc_id);
> - if (!error) {
> - idr_low = assoc_id + 1;
> + ret = idr_alloc(&sctp_assocs_id, asoc, idr_low, 0, GFP_NOWAIT);
> + if (ret >= 0) {

In SCTP, association id is not allowed to be 0, so we have to treat 0 as
an error.

-vlad

> + idr_low = ret + 1;
> if (idr_low == INT_MAX)
> idr_low = 1;
> }
> spin_unlock_bh(&sctp_assocs_id_lock);
> - if (error == -EAGAIN)
> - goto retry;
> - else if (error)
> - return error;
> + idr_preload_end();
> + if (ret < 0)
> + return ret;
>
> - asoc->assoc_id = (sctp_assoc_t) assoc_id;
> - return error;
> + asoc->assoc_id = (sctp_assoc_t)ret;
> + return 0;
> }
>
> /* Free the ASCONF queue */
>



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