From patchwork Fri Oct 2 15:41:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Mailhol X-Patchwork-Id: 11813905 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B098139A for ; Fri, 2 Oct 2020 15:50:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0C5D5207DE for ; Fri, 2 Oct 2020 15:50:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388034AbgJBPt6 (ORCPT ); Fri, 2 Oct 2020 11:49:58 -0400 Received: from smtp13.smtpout.orange.fr ([80.12.242.135]:45358 "EHLO smtp.smtpout.orange.fr" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2387688AbgJBPt6 (ORCPT ); Fri, 2 Oct 2020 11:49:58 -0400 Received: from tomoyo.flets-east.jp ([153.230.197.127]) by mwinf5d76 with ME id b3pm230052lQRaH033psje; Fri, 02 Oct 2020 17:49:57 +0200 X-ME-Helo: tomoyo.flets-east.jp X-ME-Auth: bWFpbGhvbC52aW5jZW50QHdhbmFkb28uZnI= X-ME-Date: Fri, 02 Oct 2020 17:49:57 +0200 X-ME-IP: 153.230.197.127 From: Vincent Mailhol To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-can@vger.kernel.org, Wolfgang Grandegger , Marc Kleine-Budde , "David S . Miller" , Jakub Kicinski Cc: Vincent Mailhol , Oliver Neukum , Greg Kroah-Hartman , Masahiro Yamada , Arunachalam Santhanam , linux-usb@vger.kernel.org (open list:USB ACM DRIVER) Subject: [PATCH v3 4/7] can: dev: __can_get_echo_skb(): fix the return length Date: Sat, 3 Oct 2020 00:41:48 +0900 Message-Id: <20201002154219.4887-5-mailhol.vincent@wanadoo.fr> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201002154219.4887-1-mailhol.vincent@wanadoo.fr> References: <20200926175810.278529-1-mailhol.vincent@wanadoo.fr> <20201002154219.4887-1-mailhol.vincent@wanadoo.fr> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The length of Remote Transmission Request (RTR) frames is always 0 bytes. The DLC represents the requested length, not the actual length of the RTR. But __can_get_echo_skb() returns the DLC value regardless. Apply get_can_len() function to retrieve the correct length. Signed-off-by: Vincent Mailhol --- Changes in v3: None Changes in v2: None --- drivers/net/can/dev.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index e291fda395a0..8c3e11820e03 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -481,14 +481,9 @@ __can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr) } if (priv->echo_skb[idx]) { - /* Using "struct canfd_frame::len" for the frame - * length is supported on both CAN and CANFD frames. - */ struct sk_buff *skb = priv->echo_skb[idx]; - struct canfd_frame *cf = (struct canfd_frame *)skb->data; - u8 len = cf->len; - *len_ptr = len; + *len_ptr = get_can_len(skb); priv->echo_skb[idx] = NULL; return skb;