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=-9.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 BF39BECDE46 for ; Mon, 22 Oct 2018 10:21:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7DD392089C for ; Mon, 22 Oct 2018 10:21:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="GJiyHDbD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7DD392089C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729256AbeJVSji (ORCPT ); Mon, 22 Oct 2018 14:39:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:50522 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728300AbeJVSji (ORCPT ); Mon, 22 Oct 2018 14:39:38 -0400 Received: from sasha-vm.mshome.net (unknown [167.98.65.38]) (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 CC92B20853; Mon, 22 Oct 2018 10:21:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1540203703; bh=8dK+HEkO2ALIcbeT6P1RpXgwZLSUPu0rlW4ohI2rEho=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GJiyHDbDd0JFzmIf41srRI/kf6mroqh6G/rUqRv2yx2LdtB0BtITMskmpO4WVI3rk mTdwQfhnuYc96cLFb3IRKpD1ylpe+X44lq4AgQt36TEWZ5CxV7QqjwHlAFaCSxoOYJ DC66PyRd9/D4onkRSt0BvdAkXA4Hp1XL8TOWRWcs= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Dmitry Torokhov , Sasha Levin Subject: [PATCH AUTOSEL 4.9 3/9] Input: evdev - add a schedule point in evdev_write() Date: Mon, 22 Oct 2018 06:21:27 -0400 Message-Id: <20181022102133.41222-3-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181022102133.41222-1-sashal@kernel.org> References: <20181022102133.41222-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dmitry Torokhov [ Upstream commit 36d2582ff235b4e01ad64a734c877a52dc762d9c ] Large writes to evdev interface may cause rcu stalls. Let's add cond_resched() to the loop to avoid this. Reviewed-by: Paul E. McKenney Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/evdev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index e9ae3d500a55..0bf5ad9cc492 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -558,6 +558,7 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer, input_inject_event(&evdev->handle, event.type, event.code, event.value); + cond_resched(); } out: -- 2.17.1