From patchwork Wed May 12 14:45:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 437958 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, 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 50B9EC43140 for ; Wed, 12 May 2021 16:45:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3596C61040 for ; Wed, 12 May 2021 16:45:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233871AbhELQqZ (ORCPT ); Wed, 12 May 2021 12:46:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:60668 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243369AbhELQkx (ORCPT ); Wed, 12 May 2021 12:40:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3779961E36; Wed, 12 May 2021 16:03:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620835422; bh=wp7nTbQIuWvKN3naV9vxaY6AWGocGC41NvPAVXhYoac=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JftnZ3KKfMD1ikcsBEQZrZeLsYs8sMH+8TWbLbG3ucfoFmFN9krnCz+LFOIZlgOPy fT5v+YSMhhvIh73e87j+g1MzVEZm5ArUpOOFQ3QXl6n2Oc4ONNI73LUl09/u0NIfso djwWdlzEWcFCNPhDYqo0xikC/Ps/1iKoa0+IgIlc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Sasha Levin Subject: [PATCH 5.12 304/677] serial: core: return early on unsupported ioctls Date: Wed, 12 May 2021 16:45:50 +0200 Message-Id: <20210512144847.306180744@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144837.204217980@linuxfoundation.org> References: <20210512144837.204217980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold [ Upstream commit 79c5966cec7b148199386ef9933c31b999379065 ] Drivers can return -ENOIOCTLCMD when an ioctl is not recognised to tell the upper layers to continue looking for a handler. This is not the case for the RS485 and ISO7816 ioctls whose handlers should return -ENOTTY directly in case a serial driver does not implement the corresponding methods. Fixes: a5f276f10ff7 ("serial_core: Handle TIOC[GS]RS485 ioctls.") Fixes: ad8c0eaa0a41 ("tty/serial_core: add ISO7816 infrastructure") Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20210407095208.31838-9-johan@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/serial_core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index ba31e97d3d96..43f02ed055d5 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1305,7 +1305,7 @@ static int uart_set_rs485_config(struct uart_port *port, unsigned long flags; if (!port->rs485_config) - return -ENOIOCTLCMD; + return -ENOTTY; if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) return -EFAULT; @@ -1329,7 +1329,7 @@ static int uart_get_iso7816_config(struct uart_port *port, struct serial_iso7816 aux; if (!port->iso7816_config) - return -ENOIOCTLCMD; + return -ENOTTY; spin_lock_irqsave(&port->lock, flags); aux = port->iso7816; @@ -1349,7 +1349,7 @@ static int uart_set_iso7816_config(struct uart_port *port, unsigned long flags; if (!port->iso7816_config) - return -ENOIOCTLCMD; + return -ENOTTY; if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) return -EFAULT;