Commit e51d739a authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller

net: Fix locking in flush_backlog

Need to take spinlocks when dequeuing from input_pkt_queue in flush_backlog.
Also, flush_backlog can now be called directly from netdev_run_todo.
Signed-off-by: default avatarTom Herbert <therbert@google.com>
Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ec43b1a6
......@@ -2766,17 +2766,19 @@ int netif_receive_skb(struct sk_buff *skb)
EXPORT_SYMBOL(netif_receive_skb);
/* Network device is going away, flush any packets still pending */
static void flush_backlog(void *arg)
static void flush_backlog(struct net_device *dev, int cpu)
{
struct net_device *dev = arg;
struct softnet_data *queue = &__get_cpu_var(softnet_data);
struct softnet_data *queue = &per_cpu(softnet_data, cpu);
struct sk_buff *skb, *tmp;
unsigned long flags;
spin_lock_irqsave(&queue->input_pkt_queue.lock, flags);
skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
if (skb->dev == dev) {
__skb_unlink(skb, &queue->input_pkt_queue);
kfree_skb(skb);
}
spin_unlock_irqrestore(&queue->input_pkt_queue.lock, flags);
}
static int napi_gro_complete(struct sk_buff *skb)
......@@ -5545,6 +5547,7 @@ void netdev_run_todo(void)
while (!list_empty(&list)) {
struct net_device *dev
= list_first_entry(&list, struct net_device, todo_list);
int i;
list_del(&dev->todo_list);
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
......@@ -5556,7 +5559,8 @@ void netdev_run_todo(void)
dev->reg_state = NETREG_UNREGISTERED;
on_each_cpu(flush_backlog, dev, 1);
for_each_online_cpu(i)
flush_backlog(dev, i);
netdev_wait_allrefs(dev);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment