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net: add dev->dev_registered_tracker

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Convert one dev_hold()/dev_put() pair in register_netdevice()
and unregister_netdevice_many() to dev_hold_track()
and dev_put_track().

This would allow to detect a rogue dev_put() a bit earlier.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220207184107.1401096-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-02-07 10:41:07 -08:00 committed by Jakub Kicinski
parent 99f5a5f2b9
commit b2309a71c1
2 changed files with 7 additions and 2 deletions
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3
include/linux/netdevice.h
View file

@ -1948,6 +1948,8 @@ enum netdev_ml_priv_type {
* @dev_addr_shadow: Copy of @dev_addr to catch direct writes.
* @linkwatch_dev_tracker: refcount tracker used by linkwatch.
* @watchdog_dev_tracker: refcount tracker used by watchdog.
* @dev_registered_tracker: tracker for reference held while
* registered
*
* FIXME: cleanup struct net_device such that network protocol info
* moves out.
@ -2282,6 +2284,7 @@ struct net_device {
u8 dev_addr_shadow[MAX_ADDR_LEN];
netdevice_tracker linkwatch_dev_tracker;
netdevice_tracker watchdog_dev_tracker;
netdevice_tracker dev_registered_tracker;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)

6
net/core/dev.c
View file

@ -9683,8 +9683,10 @@ int register_netdevice(struct net_device *dev)
linkwatch_init_dev(dev);
dev_init_scheduler(dev);
dev_hold(dev);
dev_hold_track(dev, &dev->dev_registered_tracker, GFP_KERNEL);
list_netdevice(dev);
add_device_randomness(dev->dev_addr, dev->addr_len);
/* If the device has permanent device address, driver should
@ -10449,7 +10451,7 @@ void unregister_netdevice_many(struct list_head *head)
synchronize_net();
list_for_each_entry(dev, head, unreg_list) {
dev_put(dev);
dev_put_track(dev, &dev->dev_registered_tracker);
net_set_todo(dev);
}