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authorDavid Howells <dhowells@redhat.com>2016-09-17 10:49:12 +0100
committerDavid Howells <dhowells@redhat.com>2016-09-17 10:53:21 +0100
commitdfa7d9204054b091949d87270e55e0fd5800c3ae (patch)
treece1e98fcd9b77d069c902607c8ce959565d7b39d /net/rxrpc/call_event.c
parentd01dc4c3c1209e865368d5f8d3b5e08f97326ca9 (diff)
downloadlinux-dfa7d9204054b091949d87270e55e0fd5800c3ae.tar.bz2
rxrpc: Fix retransmission algorithm
Make the retransmission algorithm use for-loops instead of do-loops and move the counter increments into the for-statement increment slots. Though the do-loops are slighly more efficient since there will be at least one pass through the each loop, the counter increments are harder to get right as the continue-statements skip them. Without this, if there are any positive acks within the loop, the do-loop will cycle forever because the counter increment is never done. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/call_event.c')
-rw-r--r--net/rxrpc/call_event.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 9367c3be31eb..f0cabc48a1b7 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -163,8 +163,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
*/
now = jiffies;
resend_at = now + rxrpc_resend_timeout;
- seq = cursor + 1;
- do {
+ for (seq = cursor + 1; before_eq(seq, top); seq++) {
ix = seq & RXRPC_RXTX_BUFF_MASK;
annotation = call->rxtx_annotations[ix];
if (annotation == RXRPC_TX_ANNO_ACK)
@@ -184,8 +183,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
/* Okay, we need to retransmit a packet. */
call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS;
- seq++;
- } while (before_eq(seq, top));
+ }
call->resend_at = resend_at;
@@ -194,8 +192,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
* lock is dropped, it may clear some of the retransmission markers for
* packets that it soft-ACKs.
*/
- seq = cursor + 1;
- do {
+ for (seq = cursor + 1; before_eq(seq, top); seq++) {
ix = seq & RXRPC_RXTX_BUFF_MASK;
annotation = call->rxtx_annotations[ix];
if (annotation != RXRPC_TX_ANNO_RETRANS)
@@ -237,8 +234,7 @@ static void rxrpc_resend(struct rxrpc_call *call)
if (after(call->tx_hard_ack, seq))
seq = call->tx_hard_ack;
- seq++;
- } while (before_eq(seq, top));
+ }
out_unlock:
spin_unlock_bh(&call->lock);