From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Sun, 24 Apr 2022 21:21:26 +0000 (+0200)
Subject: ngtcp2: avoid busy loop in low CWND situation
X-Git-Tag: curl-7_83_0~23
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=458c4b1df7033200e054b5d1cf78d269a457f4dd;p=thirdparty%2Fcurl.git

ngtcp2: avoid busy loop in low CWND situation

Closes #8739
---

diff --git a/lib/vquic/ngtcp2.c b/lib/vquic/ngtcp2.c
index edcb35b445..543c45c435 100644
--- a/lib/vquic/ngtcp2.c
+++ b/lib/vquic/ngtcp2.c
@@ -879,6 +879,7 @@ static int ng_getsock(struct Curl_easy *data, struct connectdata *conn,
   /* we're still uploading or the HTTP/2 layer wants to send data */
   if((k->keepon & (KEEP_SEND|KEEP_SEND_PAUSE)) == KEEP_SEND &&
      (!stream->h3out || stream->h3out->used < H3_SEND_SIZE) &&
+     ngtcp2_conn_get_cwnd_left(qs->qconn) &&
      ngtcp2_conn_get_max_data_left(qs->qconn) &&
      nghttp3_conn_is_stream_writable(qs->h3conn, stream->stream3_id))
     bitmap |= GETSOCK_WRITESOCK(FIRSTSOCKET);