From patchwork Thu Feb 11 15:02:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 381733 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF1A1C43332 for ; Thu, 11 Feb 2021 15:29:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A529564ECA for ; Thu, 11 Feb 2021 15:29:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231277AbhBKP2R (ORCPT ); Thu, 11 Feb 2021 10:28:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:53520 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230386AbhBKPYz (ORCPT ); Thu, 11 Feb 2021 10:24:55 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 82CED64EAC; Thu, 11 Feb 2021 15:03:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1613055810; bh=UX8knx71OTQhAq2JbIxW49k4VFQBjNbCR0qusov5xgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cAqb66xS1RIb/tiTtbPlTXDSzr++82Ku3ZxFwW+MiXHSBp5y9XdDJ1zsaqUOAI+xy fOP1ZUsGw3yOvPFbagZG5xvOvOvhCTahVYNNmqptjSa/ozv6SQpEQE19xnbNCjcSHS 2PIWr4q0+wTFIIhai/rV3CVsSVd5V7p0wk5a71i8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , Jens Axboe , Pavel Begunkov Subject: [PATCH 5.10 16/54] io_uring: drop mm/files between task_work_submit Date: Thu, 11 Feb 2021 16:02:00 +0100 Message-Id: <20210211150153.580290349@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210211150152.885701259@linuxfoundation.org> References: <20210211150152.885701259@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pavel Begunkov [ Upstream commit aec18a57edad562d620f7d19016de1fc0cc2208c ] Since SQPOLL task can be shared and so task_work entries can be a mix of them, we need to drop mm and files before trying to issue next request. Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: Pavel Begunkov Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2084,6 +2084,9 @@ static void __io_req_task_submit(struct else __io_req_task_cancel(req, -EFAULT); mutex_unlock(&ctx->uring_lock); + + if (ctx->flags & IORING_SETUP_SQPOLL) + io_sq_thread_drop_mm(); } static void io_req_task_submit(struct callback_head *cb)