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| author |  Eric Dumazet <edumazet@google.com>
| 2022-12-02 05:28:47 +0000 |
|---|---|---|
| committer |  Jakub Kicinski <kuba@kernel.org>
| 2022-12-02 20:44:45 -0800 |
| commit | 55fb80d518c7323d05b71eda0c9f9d657b373816 (patch) | |
| tree | 7925f5b0e805d3ff49cf635562625ce2d9905c22 /net/ipv4/tcp_ipv4.c | |
| parent | Merge tag 'wireless-next-2022-12-02' of git://git.kernel.org/pub/scm/linux/ke... (diff) | |
| download | linux-55fb80d518c7323d05b71eda0c9f9d657b373816.tar.gz linux-55fb80d518c7323d05b71eda0c9f9d657b373816.tar.bz2 linux-55fb80d518c7323d05b71eda0c9f9d657b373816.zip | |
tcp: use 2-arg optimal variant of kfree_rcu()
kfree_rcu(1-arg) should be avoided as much as possible,
since this is only possible from sleepable contexts,
and incurr extra rcu barriers.
I wish the 1-arg variant of kfree_rcu() would
get a distinct name, like kfree_rcu_slow()
to avoid it being abused.
Fixes: 459837b522f7 ("net/tcp: Disable TCP-MD5 static key on tcp_md5sig_info destruction")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20221202052847.2623997-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 7fae586405cf..8320d0ecb13a 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1245,7 +1245,7 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, md5sig = rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk)); rcu_assign_pointer(tp->md5sig_info, NULL); - kfree_rcu(md5sig); + kfree_rcu(md5sig, rcu); return -EUSERS; } } @@ -1271,7 +1271,7 @@ int tcp_md5_key_copy(struct sock *sk, const union tcp_md5_addr *addr, md5sig = rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk)); net_warn_ratelimited("Too many TCP-MD5 keys in the system\n"); rcu_assign_pointer(tp->md5sig_info, NULL); - kfree_rcu(md5sig); + kfree_rcu(md5sig, rcu); return -EUSERS; } } |