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| author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2010-04-28 08:47:18 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-28 12:16:31 -0700 |
| commit | 561b1733a465cf9677356b40c27653dd45f1ac56 (patch) | |
| tree | 86d6720a6497a0b3faa9685596d4f85d3858b6fe /include/net | |
| parent | 8d238b25b1ec22a73b1c2206f111df2faaff8285 (diff) | |
| download | linux-561b1733a465cf9677356b40c27653dd45f1ac56.tar.gz linux-561b1733a465cf9677356b40c27653dd45f1ac56.tar.bz2 linux-561b1733a465cf9677356b40c27653dd45f1ac56.zip | |
sctp: avoid irq lock inversion while call sk->sk_data_ready()
sk->sk_data_ready() of sctp socket can be called from both BH and non-BH
contexts, but the default sk->sk_data_ready(), sock_def_readable(), can
not be used in this case. Therefore, we have to make a new function
sctp_data_ready() to grab sk->sk_data_ready() with BH disabling.
=========================================================
[ INFO: possible irq lock inversion dependency detected ]
2.6.33-rc6 #129
---------------------------------------------------------
sctp_darn/1517 just changed the state of lock:
(clock-AF_INET){++.?..}, at: [<c06aab60>] sock_def_readable+0x20/0x80
but this lock took another, SOFTIRQ-unsafe lock in the past:
(slock-AF_INET){+.-...}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
1 lock held by sctp_darn/1517:
#0: (sk_lock-AF_INET){+.+.+.}, at: [<cdfe363d>] sctp_sendmsg+0x23d/0xc00 [sctp]
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/sctp/sctp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 78740ec57d5d..fa6cde578a1d 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -128,6 +128,7 @@ extern int sctp_register_pf(struct sctp_pf *, sa_family_t); int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); int sctp_inet_listen(struct socket *sock, int backlog); void sctp_write_space(struct sock *sk); +void sctp_data_ready(struct sock *sk, int len); unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait); void sctp_sock_rfree(struct sk_buff *skb); |