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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,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 92980C33CAF for ; Thu, 16 Jan 2020 23:36:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 62D1B20684 for ; Thu, 16 Jan 2020 23:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579217783; bh=1T1BEJXMUaQIjkV3UeDue1Z4USjqdymjd8/QHn0k+H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BAEAa4ubVR2segCRe+6ezgrJpwL/1uCc5Wx6TcgIJ+GDIQ/n5CUJ7TW4QaCHoMFJI 4P5dwaeJYJRzDota/y7Aiby9fZ/1sWahyvSWr3srVz4tpKnxYSk+MIBsSGIIlYP3UT xmdlfGFFzt/Gs6hPTn3dB9LBWcJzdwJTMRqQtI0M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404362AbgAPXgW (ORCPT ); Thu, 16 Jan 2020 18:36:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:40302 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391209AbgAPXbm (ORCPT ); Thu, 16 Jan 2020 18:31:42 -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 1908B20684; Thu, 16 Jan 2020 23:31:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579217502; bh=1T1BEJXMUaQIjkV3UeDue1Z4USjqdymjd8/QHn0k+H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l8j7yk4ogjO/TfL/vk5x/KuXYYeaChTyTeeG8b5yAcclEIbbIhFPCn6PkfKCsmJXA fzum8K0/0qDcx2XNbRtAO0NeSboEd1xAvdd+eamaf2nFlkUYgwoPdmzxMUMEf1tnQ1 RPi7lQ9GBNXnM+tnNCV0cz44aNGR3wNefqeKlcY4= 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 4.14 03/71] HID: hidraw, uhid: Always report EPOLLOUT Date: Fri, 17 Jan 2020 00:18:01 +0100 Message-Id: <20200116231709.908406156@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200116231709.377772748@linuxfoundation.org> References: <20200116231709.377772748@linuxfoundation.org> User-Agent: quilt/0.66 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(-) diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 1abf5008def0..5243c4120819 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -257,13 +257,14 @@ out: static unsigned int hidraw_poll(struct file *file, poll_table *wait) { struct hidraw_list *list = file->private_data; + unsigned int mask = POLLOUT | POLLWRNORM; /* hidraw is always writable */ poll_wait(file, &list->hidraw->wait, wait); if (list->head != list->tail) - return POLLIN | POLLRDNORM; + mask |= POLLIN | POLLRDNORM; if (!list->hidraw->exist) - return POLLERR | POLLHUP; - return POLLOUT | POLLWRNORM; + mask |= POLLERR | POLLHUP; + return mask; } static int hidraw_open(struct inode *inode, struct file *file) diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c index e63b761f600a..c749f449c7cb 100644 --- a/drivers/hid/uhid.c +++ b/drivers/hid/uhid.c @@ -769,13 +769,14 @@ unlock: static unsigned int uhid_char_poll(struct file *file, poll_table *wait) { struct uhid_device *uhid = file->private_data; + unsigned int mask = POLLOUT | POLLWRNORM; /* uhid is always writable */ poll_wait(file, &uhid->waitq, wait); if (uhid->head != uhid->tail) - return POLLIN | POLLRDNORM; + mask |= POLLIN | POLLRDNORM; - return EPOLLOUT | EPOLLWRNORM; + return mask; } static const struct file_operations uhid_fops = { -- 2.20.1