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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-11-24 22:09:35 -0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:54:59 -0800 |
| commit | 83399361c30f2ffae20ee348ba9ada9a856d499a (patch) | |
| tree | 51f5399c9d394ab4ec1483d7bb908566a19e8792 /net | |
| parent | da98e0b5d4c1f88b7c9e63e8918783cd4905be2b (diff) | |
| download | linux-stable-83399361c30f2ffae20ee348ba9ada9a856d499a.tar.gz linux-stable-83399361c30f2ffae20ee348ba9ada9a856d499a.tar.bz2 linux-stable-83399361c30f2ffae20ee348ba9ada9a856d499a.zip | |
[CCID2]: Remove redundant synchronisation variable
This removes the synchronisation variable `ccid2hctx_sendwait', which is set to 1
when the CCID2 sender may send a new packet, and which is set to 0 otherwise
The variable is redundant, since it is only used in combination with the hc_tx_send_packet/
hc_tx_packet_sent function pair. Both functions are called under socket lock, so the
following happens when the CCID2 may send a new packet:
* it sets sendwait = 1 in tx_send_packet and returns 0;
* the subsequent call to tx_packet_sent clears the sendwait flag;
* since tx_send_packet returns 0 if and only if sendwait == 1, the BUG_ON condition
in tx_packet_sent is never satisfied, since that function is never called when
tx_send_packet returns a value different from 0 (cf. dccp_write_xmit);
* the call to tx_packet_sent clears the flag so that the condition "!sendwait" is
true the next time tx_packet_sent is called.
In other words, it is sufficient to just return 0 / not-0 to synchronise tx_send_packet
and tx_packet_sent -- which is what the patch does.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/dccp/ccids/ccid2.c | 11 | ||||
| -rw-r--r-- | net/dccp/ccids/ccid2.h | 1 |
2 files changed, 2 insertions, 10 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c index 2d1b7e30a73c..4f6c35261b6e 100644 --- a/net/dccp/ccids/ccid2.c +++ b/net/dccp/ccids/ccid2.c @@ -126,13 +126,8 @@ static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) { struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk); - if (hctx->ccid2hctx_pipe < hctx->ccid2hctx_cwnd) { - /* OK we can send... make sure previous packet was sent off */ - if (!hctx->ccid2hctx_sendwait) { - hctx->ccid2hctx_sendwait = 1; - return 0; - } - } + if (hctx->ccid2hctx_pipe < hctx->ccid2hctx_cwnd) + return 0; return 1; /* XXX CCID should dequeue when ready instead of polling */ } @@ -236,8 +231,6 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) struct ccid2_seq *next; u64 seq; - BUG_ON(!hctx->ccid2hctx_sendwait); - hctx->ccid2hctx_sendwait = 0; hctx->ccid2hctx_pipe++; /* There is an issue. What if another packet is sent between diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h index bc659f00cb96..2671f8ebe294 100644 --- a/net/dccp/ccids/ccid2.h +++ b/net/dccp/ccids/ccid2.h @@ -66,7 +66,6 @@ struct ccid2_hc_tx_sock { struct timer_list ccid2hctx_rtotimer; u64 ccid2hctx_rpseq; int ccid2hctx_rpdupack; - int ccid2hctx_sendwait; unsigned long ccid2hctx_last_cong; u64 ccid2hctx_high_ack; }; |