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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 08977C35669 for ; Sun, 23 Feb 2020 02:37:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C50BC20659 for ; Sun, 23 Feb 2020 02:37:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582425457; bh=fAl7VpiZ6vtHx5VxgMSWgay7BJztWEmH0iSLtTDS7ak=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=us5B7nFBwBHT+848TTynB5pXbQpdPE5UNMpPLLHVKVHm/jbPKPGOvx8L1rzEgrUyh nlbuYHU06Px6TClvDvUezrLbIljm9YvM2pPmm8za/SxwCgxTAAHvHuPqnFv6uc153I mqpVJz8/oEpDpeWvVjmmP9miprToBPrIbW6CqvVc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727426AbgBWCVg (ORCPT ); Sat, 22 Feb 2020 21:21:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:49908 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727302AbgBWCVb (ORCPT ); Sat, 22 Feb 2020 21:21:31 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4CF302465D; Sun, 23 Feb 2020 02:21:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582424491; bh=fAl7VpiZ6vtHx5VxgMSWgay7BJztWEmH0iSLtTDS7ak=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NFz1faAVmywDhFYx8EckosV2YMZ3DHBC2kB5eFFIN/+scfJfc/bBOWZegVLXMds+/ +a+SE2K+sF12YWyQ3WmE5LtUF+meVcvob3pRR1yPXNfYe4OCYSk/3uXb9B28+GJoP2 H4MzcF60XKgir4XdRshrKJD7bHIcpQzdPqBrYWmE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Stefano Garzarella , Jens Axboe , Sasha Levin , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH AUTOSEL 5.5 09/58] io_uring: flush overflowed CQ events in the io_uring_poll() Date: Sat, 22 Feb 2020 21:20:30 -0500 Message-Id: <20200223022119.707-9-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200223022119.707-1-sashal@kernel.org> References: <20200223022119.707-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stefano Garzarella [ Upstream commit 63e5d81f72af1bf370bf8a6745b0a8d71a7bb37d ] In io_uring_poll() we must flush overflowed CQ events before to check if there are CQ events available, to avoid missing events. We call the io_cqring_events() that checks and flushes any overflow and returns the number of CQ events available. Signed-off-by: Stefano Garzarella Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- fs/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 6ae692b02980d..d3f4afa01731d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4979,7 +4979,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait) if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != ctx->rings->sq_ring_entries) mask |= EPOLLOUT | EPOLLWRNORM; - if (READ_ONCE(ctx->rings->cq.head) != ctx->cached_cq_tail) + if (io_cqring_events(ctx, false)) mask |= EPOLLIN | EPOLLRDNORM; return mask; -- 2.20.1