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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2018-09-11 21:42:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-20 20:46:35 +0300 |
| commit | 9a484516a4105fcc01a21b321d06f5f0b8588242 (patch) | |
| tree | a0b708871414a85cc4c81e91efbe46e0fc82eb79 | |
| parent | 50e40ebcaa32e27e62b916886f8ce2822b96778c (diff) | |
| download | linux-9a484516a4105fcc01a21b321d06f5f0b8588242.tar.xz | |
llc: avoid blocking in llc_sap_close()
[ Upstream commit 9708d2b5b7c648e8e0a40d11e8cea12f6277f33c ]
llc_sap_close() is called by llc_sap_put() which
could be called in BH context in llc_rcv(). We can't
block in BH.
There is no reason to block it here, kfree_rcu() should
be sufficient.
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | include/net/llc.h | 1 | ||||
| -rw-r--r-- | net/llc/llc_core.c | 4 |
2 files changed, 2 insertions, 3 deletions
diff --git a/include/net/llc.h b/include/net/llc.h index 890a87318014..df282d9b4017 100644 --- a/include/net/llc.h +++ b/include/net/llc.h @@ -66,6 +66,7 @@ struct llc_sap { int sk_count; struct hlist_nulls_head sk_laddr_hash[LLC_SK_LADDR_HASH_ENTRIES]; struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES]; + struct rcu_head rcu; }; static inline diff --git a/net/llc/llc_core.c b/net/llc/llc_core.c index 260b3dc1b4a2..64d4bef04e73 100644 --- a/net/llc/llc_core.c +++ b/net/llc/llc_core.c @@ -127,9 +127,7 @@ void llc_sap_close(struct llc_sap *sap) list_del_rcu(&sap->node); spin_unlock_bh(&llc_sap_list_lock); - synchronize_rcu(); - - kfree(sap); + kfree_rcu(sap, rcu); } static struct packet_type llc_packet_type __read_mostly = { |