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net, core: Allow netdev_lower_get_next_private_rcu in bh context 

For the XDP bonding slave lookup to work in the NAPI poll context in which
the redudant rcu_read_lock() has been removed we have to follow the same
approach as in 694cea395f ("bpf: Allow RCU-protected lookups to happen
from bh context") and modify the WARN_ON to also check rcu_read_lock_bh_held().

Signed-off-by: Jussi Maki <joamaki@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20210731055738.16820-6-joamaki@gmail.com
This commit is contained in:
Jussi Maki 2021-07-31 05:57:36 +00:00 committed by Daniel Borkmann
parent aeea1b86f9
commit 6891866999
1 changed files with 1 additions and 1 deletions
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2
net/core/dev.c
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@ -7615,7 +7615,7 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev,
{
struct netdev_adjacent *lower;
WARN_ON_ONCE(!rcu_read_lock_held());
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);