From 70c7a568e3c1384704228622990d6aaa2350e44e Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Tue, 19 Nov 2019 15:29:58 +0000 Subject: [PATCH 6/8] curl: Report only ready sockets MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Max Reitz Message-id: <20191119153000.101646-6-mreitz@redhat.com> Patchwork-id: 92519 O-Subject: [RHEL-8.2.0 qemu-kvm PATCH 5/7] curl: Report only ready sockets Bugzilla: 1744602 RH-Acked-by: Maxim Levitsky RH-Acked-by: Philippe Mathieu-Daudé RH-Acked-by: Stefano Garzarella Instead of reporting all sockets to cURL, only report the one that has caused curl_multi_do_locked() to be called. This lets us get rid of the QLIST_FOREACH_SAFE() list, which was actually wrong: SAFE foreaches are only safe when the current element is removed in each iteration. If it possible for the list to be concurrently modified, we cannot guarantee that only the current element will be removed. Therefore, we must not use QLIST_FOREACH_SAFE() here. Fixes: ff5ca1664af85b24a4180d595ea6873fd3deac57 Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz Message-id: 20190910124136.10565-6-mreitz@redhat.com Reviewed-by: Maxim Levitsky Reviewed-by: John Snow Signed-off-by: Max Reitz (cherry picked from commit 9abaf9fc474c3dd53e8e119326abc774c977c331) Signed-off-by: Max Reitz Signed-off-by: Danilo C. L. de Paula --- block/curl.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/block/curl.c b/block/curl.c index de00ec8..f776615 100644 --- a/block/curl.c +++ b/block/curl.c @@ -401,24 +401,19 @@ static void curl_multi_check_completion(BDRVCURLState *s) } /* Called with s->mutex held. */ -static void curl_multi_do_locked(CURLSocket *ready_socket) +static void curl_multi_do_locked(CURLSocket *socket) { - CURLSocket *socket, *next_socket; - CURLState *s = ready_socket->state; + BDRVCURLState *s = socket->state->s; int running; int r; - if (!s->s->multi) { + if (!s->multi) { return; } - /* Need to use _SAFE because curl_multi_socket_action() may trigger - * curl_sock_cb() which might modify this list */ - QLIST_FOREACH_SAFE(socket, &s->sockets, next, next_socket) { - do { - r = curl_multi_socket_action(s->s->multi, socket->fd, 0, &running); - } while (r == CURLM_CALL_MULTI_PERFORM); - } + do { + r = curl_multi_socket_action(s->multi, socket->fd, 0, &running); + } while (r == CURLM_CALL_MULTI_PERFORM); } static void curl_multi_do(void *arg) -- 1.8.3.1