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,URIBL_BLOCKED,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 42961C432C0 for ; Wed, 27 Nov 2019 21:29:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1A036206F0 for ; Wed, 27 Nov 2019 21:29:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574890187; bh=fIClEW6Xb6bv2w8wKJIOdu1DZKfm+EPitpf1xMFHoVU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HkQko4xEWe0qJx29dOk6kCah35DtAcTsJ/SWdCxZSkvTPVgNTNxlSatYqznZ1wfVT T5LvRjSqknzcAWO8Qt5/xRKImqouWWJd+dyrRrXua0xTGcbU5I2OUS5wZdYW2QdGkG VLKWdiWuzo8T8oykpHB0pOC835rYuPz3NmDPAAFM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728377AbfK0U4p (ORCPT ); Wed, 27 Nov 2019 15:56:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:47570 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731090AbfK0U4p (ORCPT ); Wed, 27 Nov 2019 15:56:45 -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 8535920862; Wed, 27 Nov 2019 20:56:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574888204; bh=fIClEW6Xb6bv2w8wKJIOdu1DZKfm+EPitpf1xMFHoVU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ewbduvcVtCt0yK09poBbhw9jOkAzWM6zpVZ/TEJidIqX/h1f83qn8NAMpQ1F+GacY iXqdKvOoAJKDgftOs3ESrVpHjuW52t+Qzb7FWH7ab5QEZrfzmSTpMVF1kYV16lL/18 0HTfBrMPxNCQWWsHA0KhgmF/NfM9OlPjBK0/Rj0U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ondrej Zary , Jens Axboe , Sasha Levin Subject: [PATCH 4.19 043/306] cdrom: dont attempt to fiddle with cdo->capability Date: Wed, 27 Nov 2019 21:28:13 +0100 Message-Id: <20191127203117.979310204@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191127203114.766709977@linuxfoundation.org> References: <20191127203114.766709977@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jens Axboe [ Upstream commit 8f94004e2a51a3ea195cf3447eb5d5906f36d8b3 ] We can't modify cdo->capability as it is defined as a const. Change the modification hack to just WARN_ON_ONCE() if we hit any of the invalid combinations. This fixes a regression for pcd, which doesn't work after the constify patch. Fixes: 853fe1bf7554 ("cdrom: Make device operations read-only") Tested-by: Ondrej Zary Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/cdrom/cdrom.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c index 27a82a559ab94..933268b8d6a54 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -411,10 +411,10 @@ static int cdrom_get_disc_info(struct cdrom_device_info *cdi, * hack to have the capability flags defined const, while we can still * change it here without gcc complaining at every line. */ -#define ENSURE(call, bits) \ -do { \ - if (cdo->call == NULL) \ - *change_capability &= ~(bits); \ +#define ENSURE(cdo, call, bits) \ +do { \ + if (cdo->call == NULL) \ + WARN_ON_ONCE((cdo)->capability & (bits)); \ } while (0) /* @@ -590,7 +590,6 @@ int register_cdrom(struct cdrom_device_info *cdi) { static char banner_printed; const struct cdrom_device_ops *cdo = cdi->ops; - int *change_capability = (int *)&cdo->capability; /* hack */ cd_dbg(CD_OPEN, "entering register_cdrom\n"); @@ -602,16 +601,16 @@ int register_cdrom(struct cdrom_device_info *cdi) cdrom_sysctl_register(); } - ENSURE(drive_status, CDC_DRIVE_STATUS); + ENSURE(cdo, drive_status, CDC_DRIVE_STATUS); if (cdo->check_events == NULL && cdo->media_changed == NULL) - *change_capability = ~(CDC_MEDIA_CHANGED | CDC_SELECT_DISC); - ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY); - ENSURE(lock_door, CDC_LOCK); - ENSURE(select_speed, CDC_SELECT_SPEED); - ENSURE(get_last_session, CDC_MULTI_SESSION); - ENSURE(get_mcn, CDC_MCN); - ENSURE(reset, CDC_RESET); - ENSURE(generic_packet, CDC_GENERIC_PACKET); + WARN_ON_ONCE(cdo->capability & (CDC_MEDIA_CHANGED | CDC_SELECT_DISC)); + ENSURE(cdo, tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY); + ENSURE(cdo, lock_door, CDC_LOCK); + ENSURE(cdo, select_speed, CDC_SELECT_SPEED); + ENSURE(cdo, get_last_session, CDC_MULTI_SESSION); + ENSURE(cdo, get_mcn, CDC_MCN); + ENSURE(cdo, reset, CDC_RESET); + ENSURE(cdo, generic_packet, CDC_GENERIC_PACKET); cdi->mc_flags = 0; cdi->options = CDO_USE_FFLAGS; -- 2.20.1