Message ID | 1487121074.8227.71.camel@edumazet-glaptop3.roam.corp.google.com |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Tue, 14 Feb 2017 17:11:14 -0800 > From: Eric Dumazet <edumazet@google.com> > > 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> Patch applied, thanks Eric.
On Tue, 14 Feb 2017 17:11:14 -0800 Eric Dumazet <eric.dumazet@gmail.com> wrote: > From: Eric Dumazet <edumazet@google.com> > > 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> Thanks. Also glad to see people are still using TCP probe.
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c index f6c50af24a64737672f7ede2ff41158bfed5f1b4..3d063eb3784828b142874c92fd2db026bea0f3b3 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); }