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list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/27/19 12:34 PM, Max Reitz wrote: > 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 > --- > block/curl.c | 17 ++++++----------- > 1 file changed, 6 insertions(+), 11 deletions(-) > > diff --git a/block/curl.c b/block/curl.c > index 05f77a38c2..bc70f39fcb 100644 > --- a/block/curl.c > +++ b/block/curl.c > @@ -394,24 +394,19 @@ 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) Only a momentary hiccup, then. > { > - CURLSocket *socket, *next_socket; > - CURLState *s = 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) > We were just calling this spuriously on whatever sockets before? Seems like a clear improvement, then.