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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 51F48C33CB6 for ; Thu, 16 Jan 2020 23:19:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20C8C20684 for ; Thu, 16 Jan 2020 23:19:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579216765; bh=7Aqib8JCONQVzpqSk85YgURpZfClIXobDqC47p+rDhw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pnenT608o8MrKUAznHBWc7f5qPeiIVoEuFkhxf3HTpaqFDGv9Yn4QpTaSs+vPaWbt jG99x973YEU0wS2FMHkI9+InI/Aht1qFlFUXGzhKlGOpwoh4ZcsjUOONOuVkzblu3w gamEpltRyyAgmkY+5ja0MyrzRQv5+YtMNRPZMc/M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389887AbgAPXTY (ORCPT ); Thu, 16 Jan 2020 18:19:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:45134 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729300AbgAPXTY (ORCPT ); Thu, 16 Jan 2020 18:19:24 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C396F2073A; Thu, 16 Jan 2020 23:19:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579216763; bh=7Aqib8JCONQVzpqSk85YgURpZfClIXobDqC47p+rDhw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vZEM/z9jec+jbpldQsdOdsDY1ftSadY8qcYeekJjqgOP4D34v3uRqz3LZLQyWyik1 DswHL0wgdS9+bEGZvXey7/zSmcP2ruclXSjw2WAOIoKGKYe1cwxVtPcs/kxp+tEuDB pe0RhBZwPMwhoQJMWHvqjXYPj+l1d1KngUsgASyI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Torvalds , Jiri Kosina , Sasha Levin Subject: [PATCH 5.4 001/203] HID: hidraw, uhid: Always report EPOLLOUT Date: Fri, 17 Jan 2020 00:15:18 +0100 Message-Id: <20200116231745.317249555@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200116231745.218684830@linuxfoundation.org> References: <20200116231745.218684830@linuxfoundation.org> User-Agent: quilt/0.66 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jiri Kosina [ Upstream commit 9e635c2851df6caee651e589fbf937b637973c91 ] hidraw and uhid device nodes are always available for writing so we should always report EPOLLOUT and EPOLLWRNORM bits, not only in the cases when there is nothing to read. Reported-by: Linus Torvalds Fixes: be54e7461ffdc ("HID: uhid: Fix returning EPOLLOUT from uhid_char_poll") Fixes: 9f3b61dc1dd7b ("HID: hidraw: Fix returning EPOLLOUT from hidraw_poll") Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/hidraw.c | 7 ++++--- drivers/hid/uhid.c | 5 +++-- 2 files changed, 7 insertions(+), 5 deletions(-) --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -249,13 +249,14 @@ out: static __poll_t hidraw_poll(struct file *file, poll_table *wait) { struct hidraw_list *list = file->private_data; + __poll_t mask = EPOLLOUT | EPOLLWRNORM; /* hidraw is always writable */ poll_wait(file, &list->hidraw->wait, wait); if (list->head != list->tail) - return EPOLLIN | EPOLLRDNORM; + mask |= EPOLLIN | EPOLLRDNORM; if (!list->hidraw->exist) - return EPOLLERR | EPOLLHUP; - return EPOLLOUT | EPOLLWRNORM; + mask |= EPOLLERR | EPOLLHUP; + return mask; } static int hidraw_open(struct inode *inode, struct file *file) --- a/drivers/hid/uhid.c +++ b/drivers/hid/uhid.c @@ -766,13 +766,14 @@ unlock: static __poll_t uhid_char_poll(struct file *file, poll_table *wait) { struct uhid_device *uhid = file->private_data; + __poll_t mask = EPOLLOUT | EPOLLWRNORM; /* uhid is always writable */ poll_wait(file, &uhid->waitq, wait); if (uhid->head != uhid->tail) - return EPOLLIN | EPOLLRDNORM; + mask |= EPOLLIN | EPOLLRDNORM; - return EPOLLOUT | EPOLLWRNORM; + return mask; } static const struct file_operations uhid_fops = {