Hi,
the goto-discussion* reminded me of the locking for the seq_file reading in
/net/ipv4/tcp_ipv4.c. If only the header** is read tcp_listen_unlock() is
called without the lock taken.
* there are some lovely gotos in /net/ipv4/tcp_ipv4.c:listening_get_next
** (void *)1 is a marker for the header.
-- Anders Gustafsson - andersg@0x63.nu - http://0x63.nu/You can import this changeset into BK by piping this whole message to: '| bk receive [path to repository]' or apply the patch as usual.
===================================================================
ChangeSet@1.973, 2003-01-07 03:27:31+01:00, andersg@0x63.nu Don't tcp_listen_unlock unless it was locked.
tcp_ipv4.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletion(-)
diff -Nru a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c --- a/net/ipv4/tcp_ipv4.c Tue Jan 7 03:41:35 2003 +++ b/net/ipv4/tcp_ipv4.c Tue Jan 7 03:41:35 2003 @@ -2412,7 +2412,8 @@ read_unlock_bh(&tp->syn_wait_lock); } case TCP_SEQ_STATE_LISTENING: - tcp_listen_unlock(); + if (v != (void *)1) + tcp_listen_unlock(); break; case TCP_SEQ_STATE_TIME_WAIT: case TCP_SEQ_STATE_ESTABLISHED:
===================================================================
This BitKeeper patch contains the following changesets: 1.973 ## Wrapped with gzip_uu ##
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This archive was generated by hypermail 2b29 : Wed Jan 15 2003 - 22:00:43 EST