mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
85670cc1fa
The move of qdisc destruction to a rcu callback broke locking in the entire qdisc layer by invalidating previously valid assumptions about the context in which changes to the qdisc tree occur. The two assumptions were: - since changes only happen in process context, read_lock doesn't need bottem half protection. Now invalid since destruction of inner qdiscs, classifiers, actions and estimators happens in the RCU callback unless they're manually deleted, resulting in dead-locks when read_lock in process context is interrupted by write_lock_bh in bottem half context. - since changes only happen under the RTNL, no additional locking is necessary for data not used during packet processing (f.e. u32_list). Again, since destruction now happens in the RCU callback, this assumption is not valid anymore, causing races while using this data, which can result in corruption or use-after-free. Instead of "fixing" this by disabling bottem halfs everywhere and adding new locks/refcounting, this patch makes these assumptions valid again by moving destruction back to process context. Since only the dev->qdisc pointer is protected by RCU, but ->enqueue and the qdisc tree are still protected by dev->qdisc_lock, destruction of the tree can be performed immediately and only the final free needs to happen in the rcu callback to make sure dev_queue_xmit doesn't access already freed memory. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
620 lines
14 KiB
C
620 lines
14 KiB
C
/*
|
|
* net/sched/sch_generic.c Generic packet scheduler routines.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
* Jamal Hadi Salim, <hadi@cyberus.ca> 990601
|
|
* - Ingress support
|
|
*/
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/in.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/init.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/list.h>
|
|
#include <net/sock.h>
|
|
#include <net/pkt_sched.h>
|
|
|
|
/* Main transmission queue. */
|
|
|
|
/* Main qdisc structure lock.
|
|
|
|
However, modifications
|
|
to data, participating in scheduling must be additionally
|
|
protected with dev->queue_lock spinlock.
|
|
|
|
The idea is the following:
|
|
- enqueue, dequeue are serialized via top level device
|
|
spinlock dev->queue_lock.
|
|
- tree walking is protected by read_lock(qdisc_tree_lock)
|
|
and this lock is used only in process context.
|
|
- updates to tree are made only under rtnl semaphore,
|
|
hence this lock may be made without local bh disabling.
|
|
|
|
qdisc_tree_lock must be grabbed BEFORE dev->queue_lock!
|
|
*/
|
|
DEFINE_RWLOCK(qdisc_tree_lock);
|
|
|
|
void qdisc_lock_tree(struct net_device *dev)
|
|
{
|
|
write_lock(&qdisc_tree_lock);
|
|
spin_lock_bh(&dev->queue_lock);
|
|
}
|
|
|
|
void qdisc_unlock_tree(struct net_device *dev)
|
|
{
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
write_unlock(&qdisc_tree_lock);
|
|
}
|
|
|
|
/*
|
|
dev->queue_lock serializes queue accesses for this device
|
|
AND dev->qdisc pointer itself.
|
|
|
|
netif_tx_lock serializes accesses to device driver.
|
|
|
|
dev->queue_lock and netif_tx_lock are mutually exclusive,
|
|
if one is grabbed, another must be free.
|
|
*/
|
|
|
|
|
|
/* Kick device.
|
|
Note, that this procedure can be called by a watchdog timer, so that
|
|
we do not check dev->tbusy flag here.
|
|
|
|
Returns: 0 - queue is empty.
|
|
>0 - queue is not empty, but throttled.
|
|
<0 - queue is not empty. Device is throttled, if dev->tbusy != 0.
|
|
|
|
NOTE: Called under dev->queue_lock with locally disabled BH.
|
|
*/
|
|
|
|
static inline int qdisc_restart(struct net_device *dev)
|
|
{
|
|
struct Qdisc *q = dev->qdisc;
|
|
struct sk_buff *skb;
|
|
|
|
/* Dequeue packet */
|
|
if (((skb = dev->gso_skb)) || ((skb = q->dequeue(q)))) {
|
|
unsigned nolock = (dev->features & NETIF_F_LLTX);
|
|
|
|
dev->gso_skb = NULL;
|
|
|
|
/*
|
|
* When the driver has LLTX set it does its own locking
|
|
* in start_xmit. No need to add additional overhead by
|
|
* locking again. These checks are worth it because
|
|
* even uncongested locks can be quite expensive.
|
|
* The driver can do trylock like here too, in case
|
|
* of lock congestion it should return -1 and the packet
|
|
* will be requeued.
|
|
*/
|
|
if (!nolock) {
|
|
if (!netif_tx_trylock(dev)) {
|
|
collision:
|
|
/* So, someone grabbed the driver. */
|
|
|
|
/* It may be transient configuration error,
|
|
when hard_start_xmit() recurses. We detect
|
|
it by checking xmit owner and drop the
|
|
packet when deadloop is detected.
|
|
*/
|
|
if (dev->xmit_lock_owner == smp_processor_id()) {
|
|
kfree_skb(skb);
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "Dead loop on netdevice %s, fix it urgently!\n", dev->name);
|
|
return -1;
|
|
}
|
|
__get_cpu_var(netdev_rx_stat).cpu_collision++;
|
|
goto requeue;
|
|
}
|
|
}
|
|
|
|
{
|
|
/* And release queue */
|
|
spin_unlock(&dev->queue_lock);
|
|
|
|
if (!netif_queue_stopped(dev)) {
|
|
int ret;
|
|
|
|
ret = dev_hard_start_xmit(skb, dev);
|
|
if (ret == NETDEV_TX_OK) {
|
|
if (!nolock) {
|
|
netif_tx_unlock(dev);
|
|
}
|
|
spin_lock(&dev->queue_lock);
|
|
return -1;
|
|
}
|
|
if (ret == NETDEV_TX_LOCKED && nolock) {
|
|
spin_lock(&dev->queue_lock);
|
|
goto collision;
|
|
}
|
|
}
|
|
|
|
/* NETDEV_TX_BUSY - we need to requeue */
|
|
/* Release the driver */
|
|
if (!nolock) {
|
|
netif_tx_unlock(dev);
|
|
}
|
|
spin_lock(&dev->queue_lock);
|
|
q = dev->qdisc;
|
|
}
|
|
|
|
/* Device kicked us out :(
|
|
This is possible in three cases:
|
|
|
|
0. driver is locked
|
|
1. fastroute is enabled
|
|
2. device cannot determine busy state
|
|
before start of transmission (f.e. dialout)
|
|
3. device is buggy (ppp)
|
|
*/
|
|
|
|
requeue:
|
|
if (skb->next)
|
|
dev->gso_skb = skb;
|
|
else
|
|
q->ops->requeue(skb, q);
|
|
netif_schedule(dev);
|
|
return 1;
|
|
}
|
|
BUG_ON((int) q->q.qlen < 0);
|
|
return q->q.qlen;
|
|
}
|
|
|
|
void __qdisc_run(struct net_device *dev)
|
|
{
|
|
if (unlikely(dev->qdisc == &noop_qdisc))
|
|
goto out;
|
|
|
|
while (qdisc_restart(dev) < 0 && !netif_queue_stopped(dev))
|
|
/* NOTHING */;
|
|
|
|
out:
|
|
clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state);
|
|
}
|
|
|
|
static void dev_watchdog(unsigned long arg)
|
|
{
|
|
struct net_device *dev = (struct net_device *)arg;
|
|
|
|
netif_tx_lock(dev);
|
|
if (dev->qdisc != &noop_qdisc) {
|
|
if (netif_device_present(dev) &&
|
|
netif_running(dev) &&
|
|
netif_carrier_ok(dev)) {
|
|
if (netif_queue_stopped(dev) &&
|
|
time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) {
|
|
|
|
printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",
|
|
dev->name);
|
|
dev->tx_timeout(dev);
|
|
}
|
|
if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))
|
|
dev_hold(dev);
|
|
}
|
|
}
|
|
netif_tx_unlock(dev);
|
|
|
|
dev_put(dev);
|
|
}
|
|
|
|
static void dev_watchdog_init(struct net_device *dev)
|
|
{
|
|
init_timer(&dev->watchdog_timer);
|
|
dev->watchdog_timer.data = (unsigned long)dev;
|
|
dev->watchdog_timer.function = dev_watchdog;
|
|
}
|
|
|
|
void __netdev_watchdog_up(struct net_device *dev)
|
|
{
|
|
if (dev->tx_timeout) {
|
|
if (dev->watchdog_timeo <= 0)
|
|
dev->watchdog_timeo = 5*HZ;
|
|
if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))
|
|
dev_hold(dev);
|
|
}
|
|
}
|
|
|
|
static void dev_watchdog_up(struct net_device *dev)
|
|
{
|
|
__netdev_watchdog_up(dev);
|
|
}
|
|
|
|
static void dev_watchdog_down(struct net_device *dev)
|
|
{
|
|
netif_tx_lock_bh(dev);
|
|
if (del_timer(&dev->watchdog_timer))
|
|
dev_put(dev);
|
|
netif_tx_unlock_bh(dev);
|
|
}
|
|
|
|
void netif_carrier_on(struct net_device *dev)
|
|
{
|
|
if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
|
|
linkwatch_fire_event(dev);
|
|
if (netif_running(dev))
|
|
__netdev_watchdog_up(dev);
|
|
}
|
|
|
|
void netif_carrier_off(struct net_device *dev)
|
|
{
|
|
if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))
|
|
linkwatch_fire_event(dev);
|
|
}
|
|
|
|
/* "NOOP" scheduler: the best scheduler, recommended for all interfaces
|
|
under all circumstances. It is difficult to invent anything faster or
|
|
cheaper.
|
|
*/
|
|
|
|
static int noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc)
|
|
{
|
|
kfree_skb(skb);
|
|
return NET_XMIT_CN;
|
|
}
|
|
|
|
static struct sk_buff *noop_dequeue(struct Qdisc * qdisc)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static int noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
|
|
{
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s deferred output. It is buggy.\n",
|
|
skb->dev->name);
|
|
kfree_skb(skb);
|
|
return NET_XMIT_CN;
|
|
}
|
|
|
|
struct Qdisc_ops noop_qdisc_ops = {
|
|
.id = "noop",
|
|
.priv_size = 0,
|
|
.enqueue = noop_enqueue,
|
|
.dequeue = noop_dequeue,
|
|
.requeue = noop_requeue,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
struct Qdisc noop_qdisc = {
|
|
.enqueue = noop_enqueue,
|
|
.dequeue = noop_dequeue,
|
|
.flags = TCQ_F_BUILTIN,
|
|
.ops = &noop_qdisc_ops,
|
|
.list = LIST_HEAD_INIT(noop_qdisc.list),
|
|
};
|
|
|
|
static struct Qdisc_ops noqueue_qdisc_ops = {
|
|
.id = "noqueue",
|
|
.priv_size = 0,
|
|
.enqueue = noop_enqueue,
|
|
.dequeue = noop_dequeue,
|
|
.requeue = noop_requeue,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct Qdisc noqueue_qdisc = {
|
|
.enqueue = NULL,
|
|
.dequeue = noop_dequeue,
|
|
.flags = TCQ_F_BUILTIN,
|
|
.ops = &noqueue_qdisc_ops,
|
|
.list = LIST_HEAD_INIT(noqueue_qdisc.list),
|
|
};
|
|
|
|
|
|
static const u8 prio2band[TC_PRIO_MAX+1] =
|
|
{ 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 };
|
|
|
|
/* 3-band FIFO queue: old style, but should be a bit faster than
|
|
generic prio+fifo combination.
|
|
*/
|
|
|
|
#define PFIFO_FAST_BANDS 3
|
|
|
|
static inline struct sk_buff_head *prio2list(struct sk_buff *skb,
|
|
struct Qdisc *qdisc)
|
|
{
|
|
struct sk_buff_head *list = qdisc_priv(qdisc);
|
|
return list + prio2band[skb->priority & TC_PRIO_MAX];
|
|
}
|
|
|
|
static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc)
|
|
{
|
|
struct sk_buff_head *list = prio2list(skb, qdisc);
|
|
|
|
if (skb_queue_len(list) < qdisc->dev->tx_queue_len) {
|
|
qdisc->q.qlen++;
|
|
return __qdisc_enqueue_tail(skb, qdisc, list);
|
|
}
|
|
|
|
return qdisc_drop(skb, qdisc);
|
|
}
|
|
|
|
static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc)
|
|
{
|
|
int prio;
|
|
struct sk_buff_head *list = qdisc_priv(qdisc);
|
|
|
|
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
|
|
if (!skb_queue_empty(list + prio)) {
|
|
qdisc->q.qlen--;
|
|
return __qdisc_dequeue_head(qdisc, list + prio);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
|
|
{
|
|
qdisc->q.qlen++;
|
|
return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc));
|
|
}
|
|
|
|
static void pfifo_fast_reset(struct Qdisc* qdisc)
|
|
{
|
|
int prio;
|
|
struct sk_buff_head *list = qdisc_priv(qdisc);
|
|
|
|
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
|
|
__qdisc_reset_queue(qdisc, list + prio);
|
|
|
|
qdisc->qstats.backlog = 0;
|
|
qdisc->q.qlen = 0;
|
|
}
|
|
|
|
static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb)
|
|
{
|
|
struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
|
|
|
|
memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1);
|
|
RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int pfifo_fast_init(struct Qdisc *qdisc, struct rtattr *opt)
|
|
{
|
|
int prio;
|
|
struct sk_buff_head *list = qdisc_priv(qdisc);
|
|
|
|
for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
|
|
skb_queue_head_init(list + prio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct Qdisc_ops pfifo_fast_ops = {
|
|
.id = "pfifo_fast",
|
|
.priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head),
|
|
.enqueue = pfifo_fast_enqueue,
|
|
.dequeue = pfifo_fast_dequeue,
|
|
.requeue = pfifo_fast_requeue,
|
|
.init = pfifo_fast_init,
|
|
.reset = pfifo_fast_reset,
|
|
.dump = pfifo_fast_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops)
|
|
{
|
|
void *p;
|
|
struct Qdisc *sch;
|
|
unsigned int size;
|
|
int err = -ENOBUFS;
|
|
|
|
/* ensure that the Qdisc and the private data are 32-byte aligned */
|
|
size = QDISC_ALIGN(sizeof(*sch));
|
|
size += ops->priv_size + (QDISC_ALIGNTO - 1);
|
|
|
|
p = kzalloc(size, GFP_KERNEL);
|
|
if (!p)
|
|
goto errout;
|
|
sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p);
|
|
sch->padded = (char *) sch - (char *) p;
|
|
|
|
INIT_LIST_HEAD(&sch->list);
|
|
skb_queue_head_init(&sch->q);
|
|
sch->ops = ops;
|
|
sch->enqueue = ops->enqueue;
|
|
sch->dequeue = ops->dequeue;
|
|
sch->dev = dev;
|
|
dev_hold(dev);
|
|
sch->stats_lock = &dev->queue_lock;
|
|
atomic_set(&sch->refcnt, 1);
|
|
|
|
return sch;
|
|
errout:
|
|
return ERR_PTR(-err);
|
|
}
|
|
|
|
struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops)
|
|
{
|
|
struct Qdisc *sch;
|
|
|
|
sch = qdisc_alloc(dev, ops);
|
|
if (IS_ERR(sch))
|
|
goto errout;
|
|
|
|
if (!ops->init || ops->init(sch, NULL) == 0)
|
|
return sch;
|
|
|
|
qdisc_destroy(sch);
|
|
errout:
|
|
return NULL;
|
|
}
|
|
|
|
/* Under dev->queue_lock and BH! */
|
|
|
|
void qdisc_reset(struct Qdisc *qdisc)
|
|
{
|
|
struct Qdisc_ops *ops = qdisc->ops;
|
|
|
|
if (ops->reset)
|
|
ops->reset(qdisc);
|
|
}
|
|
|
|
/* this is the rcu callback function to clean up a qdisc when there
|
|
* are no further references to it */
|
|
|
|
static void __qdisc_destroy(struct rcu_head *head)
|
|
{
|
|
struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu);
|
|
kfree((char *) qdisc - qdisc->padded);
|
|
}
|
|
|
|
/* Under dev->queue_lock and BH! */
|
|
|
|
void qdisc_destroy(struct Qdisc *qdisc)
|
|
{
|
|
struct Qdisc_ops *ops = qdisc->ops;
|
|
|
|
if (qdisc->flags & TCQ_F_BUILTIN ||
|
|
!atomic_dec_and_test(&qdisc->refcnt))
|
|
return;
|
|
|
|
list_del(&qdisc->list);
|
|
#ifdef CONFIG_NET_ESTIMATOR
|
|
gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est);
|
|
#endif
|
|
if (ops->reset)
|
|
ops->reset(qdisc);
|
|
if (ops->destroy)
|
|
ops->destroy(qdisc);
|
|
|
|
module_put(ops->owner);
|
|
dev_put(qdisc->dev);
|
|
call_rcu(&qdisc->q_rcu, __qdisc_destroy);
|
|
}
|
|
|
|
void dev_activate(struct net_device *dev)
|
|
{
|
|
/* No queueing discipline is attached to device;
|
|
create default one i.e. pfifo_fast for devices,
|
|
which need queueing and noqueue_qdisc for
|
|
virtual interfaces
|
|
*/
|
|
|
|
if (dev->qdisc_sleeping == &noop_qdisc) {
|
|
struct Qdisc *qdisc;
|
|
if (dev->tx_queue_len) {
|
|
qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops);
|
|
if (qdisc == NULL) {
|
|
printk(KERN_INFO "%s: activation failed\n", dev->name);
|
|
return;
|
|
}
|
|
write_lock(&qdisc_tree_lock);
|
|
list_add_tail(&qdisc->list, &dev->qdisc_list);
|
|
write_unlock(&qdisc_tree_lock);
|
|
} else {
|
|
qdisc = &noqueue_qdisc;
|
|
}
|
|
write_lock(&qdisc_tree_lock);
|
|
dev->qdisc_sleeping = qdisc;
|
|
write_unlock(&qdisc_tree_lock);
|
|
}
|
|
|
|
if (!netif_carrier_ok(dev))
|
|
/* Delay activation until next carrier-on event */
|
|
return;
|
|
|
|
spin_lock_bh(&dev->queue_lock);
|
|
rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping);
|
|
if (dev->qdisc != &noqueue_qdisc) {
|
|
dev->trans_start = jiffies;
|
|
dev_watchdog_up(dev);
|
|
}
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
}
|
|
|
|
void dev_deactivate(struct net_device *dev)
|
|
{
|
|
struct Qdisc *qdisc;
|
|
|
|
spin_lock_bh(&dev->queue_lock);
|
|
qdisc = dev->qdisc;
|
|
dev->qdisc = &noop_qdisc;
|
|
|
|
qdisc_reset(qdisc);
|
|
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
|
|
dev_watchdog_down(dev);
|
|
|
|
/* Wait for outstanding dev_queue_xmit calls. */
|
|
synchronize_rcu();
|
|
|
|
/* Wait for outstanding qdisc_run calls. */
|
|
while (test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
|
|
yield();
|
|
|
|
if (dev->gso_skb) {
|
|
kfree_skb(dev->gso_skb);
|
|
dev->gso_skb = NULL;
|
|
}
|
|
}
|
|
|
|
void dev_init_scheduler(struct net_device *dev)
|
|
{
|
|
qdisc_lock_tree(dev);
|
|
dev->qdisc = &noop_qdisc;
|
|
dev->qdisc_sleeping = &noop_qdisc;
|
|
INIT_LIST_HEAD(&dev->qdisc_list);
|
|
qdisc_unlock_tree(dev);
|
|
|
|
dev_watchdog_init(dev);
|
|
}
|
|
|
|
void dev_shutdown(struct net_device *dev)
|
|
{
|
|
struct Qdisc *qdisc;
|
|
|
|
qdisc_lock_tree(dev);
|
|
qdisc = dev->qdisc_sleeping;
|
|
dev->qdisc = &noop_qdisc;
|
|
dev->qdisc_sleeping = &noop_qdisc;
|
|
qdisc_destroy(qdisc);
|
|
#if defined(CONFIG_NET_SCH_INGRESS) || defined(CONFIG_NET_SCH_INGRESS_MODULE)
|
|
if ((qdisc = dev->qdisc_ingress) != NULL) {
|
|
dev->qdisc_ingress = NULL;
|
|
qdisc_destroy(qdisc);
|
|
}
|
|
#endif
|
|
BUG_TRAP(!timer_pending(&dev->watchdog_timer));
|
|
qdisc_unlock_tree(dev);
|
|
}
|
|
|
|
EXPORT_SYMBOL(__netdev_watchdog_up);
|
|
EXPORT_SYMBOL(netif_carrier_on);
|
|
EXPORT_SYMBOL(netif_carrier_off);
|
|
EXPORT_SYMBOL(noop_qdisc);
|
|
EXPORT_SYMBOL(noop_qdisc_ops);
|
|
EXPORT_SYMBOL(qdisc_create_dflt);
|
|
EXPORT_SYMBOL(qdisc_alloc);
|
|
EXPORT_SYMBOL(qdisc_destroy);
|
|
EXPORT_SYMBOL(qdisc_reset);
|
|
EXPORT_SYMBOL(qdisc_lock_tree);
|
|
EXPORT_SYMBOL(qdisc_unlock_tree);
|