4.4.102-rt117-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
The locking path can be recursive (same as for sk->sk_lock.slock) and
therefore we need a trylock version for the locallock, too.
Cc: stable-rt@xxxxxxxxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
net/ipv4/icmp.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index ff2593269089..2c1ce3e80ee4 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -219,7 +219,11 @@ static inline struct sock *icmp_xmit_lock(struct net *net)
local_bh_disable();
- local_lock(icmp_sk_lock);
+ if (!local_trylock(icmp_sk_lock)) {
+ local_bh_enable();
+ return NULL;
+ }
+
sk = icmp_sk(net);
if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
--
2.13.2
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