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net: transition netdev reg state earlier in run_todo

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In prep for unregistering netdevs out of order move the netdev
state validation and change outside of the loop.

While at it modernize this code and use WARN() instead of
pr_err() + dump_stack().

Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/20220215225310.3679266-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-02-15 14:53:09 -08:00
parent 4d449bdc5b
commit ae68db14b6
1 changed files with 9 additions and 9 deletions
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18
net/core/dev.c
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@ -9906,6 +9906,7 @@ static void netdev_wait_allrefs(struct net_device *dev)
*/
void netdev_run_todo(void)
{
struct net_device *dev, *tmp;
struct list_head list;
#ifdef CONFIG_LOCKDEP
struct list_head unlink_list;
@ -9926,24 +9927,23 @@ void netdev_run_todo(void)
__rtnl_unlock();
/* Wait for rcu callbacks to finish before next phase */
if (!list_empty(&list))
rcu_barrier();
while (!list_empty(&list)) {
struct net_device *dev
= list_first_entry(&list, struct net_device, todo_list);
list_del(&dev->todo_list);
list_for_each_entry_safe(dev, tmp, &list, todo_list) {
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
pr_err("network todo '%s' but state %d\n",
dev->name, dev->reg_state);
dump_stack();
netdev_WARN(dev, "run_todo but not unregistering\n");
list_del(&dev->todo_list);
continue;
}
dev->reg_state = NETREG_UNREGISTERED;
}
while (!list_empty(&list)) {
dev = list_first_entry(&list, struct net_device, todo_list);
list_del(&dev->todo_list);
netdev_wait_allrefs(dev);