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author | Xin Long <lucien.xin@gmail.com> | 2016-09-14 02:04:18 +0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2016-09-18 22:02:32 -0400 |
commit | 2c89791eeb6f3873349c240345c1879ef6a16f63 (patch) | |
tree | 35a7c0f604a6dd7564e2017c126fdb201c1343d6 | |
parent | fd9527f404d51e50f40dac0d9a69f2eff3dac33e (diff) | |
download | linux-2c89791eeb6f3873349c240345c1879ef6a16f63.tar.gz linux-2c89791eeb6f3873349c240345c1879ef6a16f63.tar.bz2 linux-2c89791eeb6f3873349c240345c1879ef6a16f63.zip |
sctp: remove the unnecessary state check in sctp_outq_tail
Data Chunks are only sent by sctp_primitive_SEND, in which sctp checks
the asoc's state through statetable before calling sctp_outq_tail. So
there's no need to check the asoc's state again in sctp_outq_tail.
Besides, sctp_do_sm is protected by lock_sock, even if sending msg is
interrupted by timer events, the event's processes still need to acquire
lock_sock first. It means no others CMDs can be enqueue into side effect
list before CMD_SEND_MSG to change asoc->state, so it's safe to remove it.
This patch is to remove redundant asoc->state check from sctp_outq_tail.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | net/sctp/outqueue.c | 53 |
1 files changed, 14 insertions, 39 deletions
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c index 72e54a416af6..da2418b64c86 100644 --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -299,50 +299,25 @@ int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk, gfp_t gfp) * immediately. */ if (sctp_chunk_is_data(chunk)) { - /* Is it OK to queue data chunks? */ - /* From 9. Termination of Association - * - * When either endpoint performs a shutdown, the - * association on each peer will stop accepting new - * data from its user and only deliver data in queue - * at the time of sending or receiving the SHUTDOWN - * chunk. - */ - switch (q->asoc->state) { - case SCTP_STATE_CLOSED: - case SCTP_STATE_SHUTDOWN_PENDING: - case SCTP_STATE_SHUTDOWN_SENT: - case SCTP_STATE_SHUTDOWN_RECEIVED: - case SCTP_STATE_SHUTDOWN_ACK_SENT: - /* Cannot send after transport endpoint shutdown */ - error = -ESHUTDOWN; - break; - - default: - pr_debug("%s: outqueueing: outq:%p, chunk:%p[%s])\n", - __func__, q, chunk, chunk && chunk->chunk_hdr ? - sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) : - "illegal chunk"); - - sctp_chunk_hold(chunk); - sctp_outq_tail_data(q, chunk); - if (chunk->asoc->prsctp_enable && - SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags)) - chunk->asoc->sent_cnt_removable++; - if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) - SCTP_INC_STATS(net, SCTP_MIB_OUTUNORDERCHUNKS); - else - SCTP_INC_STATS(net, SCTP_MIB_OUTORDERCHUNKS); - break; - } + pr_debug("%s: outqueueing: outq:%p, chunk:%p[%s])\n", + __func__, q, chunk, chunk && chunk->chunk_hdr ? + sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) : + "illegal chunk"); + + sctp_chunk_hold(chunk); + sctp_outq_tail_data(q, chunk); + if (chunk->asoc->prsctp_enable && + SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags)) + chunk->asoc->sent_cnt_removable++; + if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) + SCTP_INC_STATS(net, SCTP_MIB_OUTUNORDERCHUNKS); + else + SCTP_INC_STATS(net, SCTP_MIB_OUTORDERCHUNKS); } else { list_add_tail(&chunk->list, &q->control_chunk_list); SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); } - if (error < 0) - return error; - if (!q->cork) error = sctp_outq_flush(q, 0, gfp); |