From: Kees Cook keescook@chromium.org

This converts all remaining cases of the old setup_timer() API into using timer_setup(), where the callback argument is the structure already holding the struct timer_list. These should have no behavioral changes, since they just change which pointer is passed into the callback with the same available pointers after conversion.

Signed-off-by: Kees Cook keescook@chromium.org [sven@narfation.org: removed spatch and examples, added compat code] Signed-off-by: Sven Eckelmann sven@narfation.org --- compat-include/linux/timer.h | 59 ++++++++++++++++++++++++++++++++++++++++++++ net/batman-adv/tp_meter.c | 14 +++++------ 2 files changed, 65 insertions(+), 8 deletions(-) create mode 100644 compat-include/linux/timer.h

diff --git a/compat-include/linux/timer.h b/compat-include/linux/timer.h new file mode 100644 index 0000000..750b6ae --- /dev/null +++ b/compat-include/linux/timer.h @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2007-2017 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see http://www.gnu.org/licenses/. + * + * License-Filename: LICENSES/preferred/GPL-2.0 + * + * This file contains macros for maintaining compatibility with older versions + * of the Linux kernel. + */ + +#ifndef _NET_BATMAN_ADV_COMPAT_LINUX_TIMER_H +#define _NET_BATMAN_ADV_COMPAT_LINUX_TIMER_H + +#include <linux/version.h> +#include_next <linux/timer.h> + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0) + +#define __setup_timer(_timer, _fn, _data, _flags) \ + do { \ + init_timer(_timer); \ + (_timer)->function = (_fn); \ + (_timer)->data = (_data); \ + } while (0) + +#endif /* < KERNEL_VERSION(3, 7, 0) */ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) + +#define TIMER_DATA_TYPE unsigned long +#define TIMER_FUNC_TYPE void (*)(TIMER_DATA_TYPE) + +static inline void timer_setup(struct timer_list *timer, + void (*callback)(struct timer_list *), + unsigned int flags) +{ + __setup_timer(timer, (TIMER_FUNC_TYPE)callback, + (TIMER_DATA_TYPE)timer, flags); +} + +#define from_timer(var, callback_timer, timer_fieldname) \ + container_of(callback_timer, typeof(*var), timer_fieldname) + +#endif /* < KERNEL_VERSION(4, 14, 0) */ + +#endif /* _NET_BATMAN_ADV_COMPAT_LINUX_TIMER_H */ diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c index 4b90033..15cd213 100644 --- a/net/batman-adv/tp_meter.c +++ b/net/batman-adv/tp_meter.c @@ -488,9 +488,9 @@ static void batadv_tp_reset_sender_timer(struct batadv_tp_vars *tp_vars) * Switch to Slow Start, set the ss_threshold to half of the current cwnd and * reset the cwnd to 3*MSS */ -static void batadv_tp_sender_timeout(unsigned long arg) +static void batadv_tp_sender_timeout(struct timer_list *t) { - struct batadv_tp_vars *tp_vars = (struct batadv_tp_vars *)arg; + struct batadv_tp_vars *tp_vars = from_timer(tp_vars, t, timer); struct batadv_priv *bat_priv = tp_vars->bat_priv;

if (atomic_read(&tp_vars->sending) == 0) @@ -1020,8 +1020,7 @@ void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst, atomic64_set(&tp_vars->tot_sent, 0);

kref_get(&tp_vars->refcount); - setup_timer(&tp_vars->timer, batadv_tp_sender_timeout, - (unsigned long)tp_vars); + timer_setup(&tp_vars->timer, batadv_tp_sender_timeout, 0);

tp_vars->bat_priv = bat_priv; tp_vars->start_time = jiffies; @@ -1109,9 +1108,9 @@ static void batadv_tp_reset_receiver_timer(struct batadv_tp_vars *tp_vars) * reached without received ack * @arg: address of the related tp_vars */ -static void batadv_tp_receiver_shutdown(unsigned long arg) +static void batadv_tp_receiver_shutdown(struct timer_list *t) { - struct batadv_tp_vars *tp_vars = (struct batadv_tp_vars *)arg; + struct batadv_tp_vars *tp_vars = from_timer(tp_vars, t, timer); struct batadv_tp_unacked *un, *safe; struct batadv_priv *bat_priv;

@@ -1373,8 +1372,7 @@ batadv_tp_init_recv(struct batadv_priv *bat_priv, hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list);

kref_get(&tp_vars->refcount); - setup_timer(&tp_vars->timer, batadv_tp_receiver_shutdown, - (unsigned long)tp_vars); + timer_setup(&tp_vars->timer, batadv_tp_receiver_shutdown, 0);

batadv_tp_reset_receiver_timer(tp_vars);