From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2150CCA479 for ; Thu, 7 Jul 2022 14:14:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235259AbiGGOOV (ORCPT ); Thu, 7 Jul 2022 10:14:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235059AbiGGOOU (ORCPT ); Thu, 7 Jul 2022 10:14:20 -0400 Received: from mail-ej1-x631.google.com (mail-ej1-x631.google.com [IPv6:2a00:1450:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ACC2C2F39A for ; Thu, 7 Jul 2022 07:14:19 -0700 (PDT) Received: by mail-ej1-x631.google.com with SMTP id o25so32690093ejm.3 for ; Thu, 07 Jul 2022 07:14:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FoaoLGayVR9g1LFSguZ7ChvtAEKoJH/jleNZLvLR1+A=; b=BOHYKCXCvG0ixGvUIhD265l0Fdv8ON05wJjzTgzVAaqCv/RO0CZkR8fpM15sQAAOAm IPEmS/v0pIss3Ou38Dv6R+qeUXWKN8EuLfIb8guzjYAjsV5mbmRR28uXrSinnHrN4Ifg 8MCbkQaHATNHK/MtwV36busUIEmUW6rOfCfmzn/co3pZsusgd3Hei5Lq04P5iofDRAxz to71ljoKbpEuWDlIJN25CMRPDiqHB/hGojGqVFXQKN5r2l8KmyH9HblVc6byoj5Z52zy pNfioXGlBWIgRfe4bhDyF0f7v91m1MBlRLpdxrnXU04kKtEMIt6Jmo+8PWIu2qrzJV7c oE8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=FoaoLGayVR9g1LFSguZ7ChvtAEKoJH/jleNZLvLR1+A=; b=6KsC4FLh/R6te1GxU7X9TEh1Xt2UX+TaO+RZxs8tvTbmCSM0dOpbLJG+Rm5MNRL0QA IRYyzh9I2wbtY2kBvQRJT/pxodH6nldZ1QNN7ddiJ+j3xGvv5wP/kU+6mtI8qBaV7BsR 8MBc7aG0pFdERAry9zCYI7x1Qf7dUEAFtYHHzPAT2kIz72QUpP7C3AqbiCi2o1cFWbsl xK+Q9wZkaMGg7EMTtoUSHSWmBx6wCHoFE5qKmghSpniXfgReNbFAVHnI6fksSOJQN4Wh Um1oSmLyft8vPxwaS1vFHLXv6C2UuNGNszkdcdLxiYFg6CHb+yJbXIDnUI+p+YyeTr2j /dDA== X-Gm-Message-State: AJIora/gGrrA81vKTNQXQuuq6bei91GXi+VUIZkbWMJerkHXpt9y71JU HSNYxHujNZLS2LSgIuU8dB/PQnNduiaeHdGF X-Google-Smtp-Source: AGRyM1vzLNpzJaE/hHDIMcuELbEauevRRdSRR89Vd8EYZRQA8fnZ4mifuBXXz84IR3D9KvmvWZxYDg== X-Received: by 2002:a17:907:72cf:b0:72a:e56a:3157 with SMTP id du15-20020a17090772cf00b0072ae56a3157mr14330079ejc.465.1657203258008; Thu, 07 Jul 2022 07:14:18 -0700 (PDT) Received: from 127.0.0.1localhost.com ([2620:10d:c093:600::1:3fc3]) by smtp.gmail.com with ESMTPSA id bq15-20020a056402214f00b00435a742e350sm28254125edb.75.2022.07.07.07.14.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 07:14:17 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com Subject: [PATCH for-next 2/4] io_uring: don't race double poll setting REQ_F_ASYNC_DATA Date: Thu, 7 Jul 2022 15:13:15 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Just as with io_poll_double_prepare() setting REQ_F_DOUBLE_POLL, we can race with the first poll entry when setting REQ_F_ASYNC_DATA. Move it under io_poll_double_prepare(). Fixes: a18427bb2d9b ("io_uring: optimise submission side poll_refs") Signed-off-by: Pavel Begunkov --- io_uring/poll.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/io_uring/poll.c b/io_uring/poll.c index 3710a0a46a87..c1359d45a396 100644 --- a/io_uring/poll.c +++ b/io_uring/poll.c @@ -410,6 +410,8 @@ static void io_poll_double_prepare(struct io_kiocb *req) spin_lock_irq(&head->lock); req->flags |= REQ_F_DOUBLE_POLL; + if (req->opcode == IORING_OP_POLL_ADD) + req->flags |= REQ_F_ASYNC_DATA; if (head) spin_unlock_irq(&head->lock); @@ -448,13 +450,11 @@ static void __io_queue_proc(struct io_poll *poll, struct io_poll_table *pt, return; } - io_poll_double_prepare(req); /* mark as double wq entry */ wqe_private |= IO_WQE_F_DOUBLE; io_init_poll_iocb(poll, first->events, first->wait.func); + io_poll_double_prepare(req); *poll_ptr = poll; - if (req->opcode == IORING_OP_POLL_ADD) - req->flags |= REQ_F_ASYNC_DATA; } else { /* fine to modify, there is no poll queued to race with us */ req->flags |= REQ_F_SINGLE_POLL; -- 2.36.1