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| author | Zach Brown <zach.brown@oracle.com> | 2007-06-22 15:14:46 -0700 |
|---|---|---|
| committer | Vlad Yasevich <vladislav.yasevich@hp.com> | 2007-06-26 09:29:09 -0400 |
| commit | 5131a184a3458d9ac47d9eba032cf4c4d3295afd (patch) | |
| tree | 1f216caeef9c70ff5bc76fd08fa7f5a0ae2cbe99 /net/sctp/socket.c | |
| parent | 186e234358ba29a4094d0c8c0d3ea00f84d32a3e (diff) | |
| download | lwn-5131a184a3458d9ac47d9eba032cf4c4d3295afd.tar.gz lwn-5131a184a3458d9ac47d9eba032cf4c4d3295afd.zip | |
SCTP: lock_sock_nested in sctp_sock_migrate
sctp_sock_migrate() grabs the socket lock on a newly allocated socket while
holding the socket lock on an old socket. lockdep worries that this might
be a recursive lock attempt.
task/3026 is trying to acquire lock:
(sk_lock-AF_INET){--..}, at: [<ffffffff88105b8c>] sctp_sock_migrate+0x2e3/0x327 [sctp]
but task is already holding lock:
(sk_lock-AF_INET){--..}, at: [<ffffffff8810891f>] sctp_accept+0xdf/0x1e3 [sctp]
This patch tells lockdep that this locking is safe by using
lock_sock_nested().
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Diffstat (limited to 'net/sctp/socket.c')
| -rw-r--r-- | net/sctp/socket.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 2fc036699d48..67861a8f00cb 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -6123,8 +6123,11 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk, * queued to the backlog. This prevents a potential race between * backlog processing on the old socket and new-packet processing * on the new socket. + * + * The caller has just allocated newsk so we can guarantee that other + * paths won't try to lock it and then oldsk. */ - sctp_lock_sock(newsk); + lock_sock_nested(newsk, SINGLE_DEPTH_NESTING); sctp_assoc_migrate(assoc, newsk); /* If the association on the newsk is already closed before accept() |