From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752264Ab2IJOZN (ORCPT ); Mon, 10 Sep 2012 10:25:13 -0400 Received: from mx01.eia.be ([195.130.156.18]:38178 "EHLO mail.eia.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750871Ab2IJOZL convert rfc822-to-8bit (ORCPT ); Mon, 10 Sep 2012 10:25:11 -0400 Date: Mon, 10 Sep 2012 16:25:07 +0200 From: Kurt Van Dijck To: Fabio Baltieri CC: Oliver Hartkopp , Marc Kleine-Budde , Wolfgang Grandegger , , Subject: [PATCH] can: export a safe netdev_priv wrapper for candev Message-ID: <20120910142507.GA11000@vandijck-laurijssen.be> Mail-Followup-To: Fabio Baltieri , Oliver Hartkopp , Marc Kleine-Budde , Wolfgang Grandegger , linux-kernel@vger.kernel.org, linux-can@vger.kernel.org References: <20120907071934.GB37685@macbook.local> <1347207464-2002-1-git-send-email-fabio.baltieri@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <1347207464-2002-1-git-send-email-fabio.baltieri@gmail.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org can: export a safe netdev_priv wrapper for candev In net_device notifier calls, it was impossible to determine if a CAN device is based on candev in a safe way. This patch adds such test in order to access candev storage from within those notifiers. Signed-off-by: Kurt Van Dijck diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 963e2cc..6c1e704 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -795,6 +795,18 @@ void unregister_candev(struct net_device *dev) } EXPORT_SYMBOL_GPL(unregister_candev); +/* + * Test if a network device is a candev based device + * and return the can_priv* if so. + */ +struct can_priv *safe_candev_priv(struct net_device *dev) +{ + if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops)) + return NULL; + + return netdev_priv(dev); +} + static __init int can_dev_init(void) { int err; diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h index 7747d9b..fb0ab65 100644 --- a/include/linux/can/dev.h +++ b/include/linux/can/dev.h @@ -106,6 +106,9 @@ u8 can_len2dlc(u8 len); struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max); void free_candev(struct net_device *dev); +/* a candev safe wrapper around netdev_priv */ +struct can_priv *safe_candev_priv(struct net_device *dev); + int open_candev(struct net_device *dev); void close_candev(struct net_device *dev);