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authorEric Dumazet <edumazet@google.com>2017-02-14 17:11:14 -0800
committerDavid S. Miller <davem@davemloft.net>2017-02-14 22:19:39 -0500
commite70ac171658679ecf6bea4bbd9e9325cd6079d2b (patch)
tree6757ae4ff0186cf6b68b57797c983b143577967b /net
parenta725eb15db80643a160310ed6bcfd6c5a6c907f2 (diff)
downloadlinux-e70ac171658679ecf6bea4bbd9e9325cd6079d2b.tar.bz2
tcp: tcp_probe: use spin_lock_bh()
tcp_rcv_established() can now run in process context. We need to disable BH while acquiring tcp probe spinlock, or risk a deadlock. Fixes: 5413d1babe8f ("net: do not block BH while processing socket backlog") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Ricardo Nabinger Sanchez <rnsanchez@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_probe.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c
index f6c50af24a64..3d063eb37848 100644
--- a/net/ipv4/tcp_probe.c
+++ b/net/ipv4/tcp_probe.c
@@ -117,7 +117,7 @@ static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
(fwmark > 0 && skb->mark == fwmark)) &&
(full || tp->snd_cwnd != tcp_probe.lastcwnd)) {
- spin_lock(&tcp_probe.lock);
+ spin_lock_bh(&tcp_probe.lock);
/* If log fills, just silently drop */
if (tcp_probe_avail() > 1) {
struct tcp_log *p = tcp_probe.log + tcp_probe.head;
@@ -157,7 +157,7 @@ static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
tcp_probe.head = (tcp_probe.head + 1) & (bufsize - 1);
}
tcp_probe.lastcwnd = tp->snd_cwnd;
- spin_unlock(&tcp_probe.lock);
+ spin_unlock_bh(&tcp_probe.lock);
wake_up(&tcp_probe.wait);
}