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author | Jarek Poplawski <jarkao2@gmail.com> | 2008-02-12 06:24:56 +0100 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-02-13 02:53:31 +0100 |
commit | 1105b5d1d44e6f00e31422dfcb0139bc8ae966a9 (patch) | |
tree | 14cf0671196b0dbe3de6c51fede38b6d70164850 /net/netrom | |
parent | fib_trie: /proc/net/route performance improvement (diff) | |
download | linux-1105b5d1d44e6f00e31422dfcb0139bc8ae966a9.tar.xz linux-1105b5d1d44e6f00e31422dfcb0139bc8ae966a9.zip |
[AX25] af_ax25: remove sock lock in ax25_info_show()
This lockdep warning:
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.24 #3
> -------------------------------------------------------
> swapper/0 is trying to acquire lock:
> (ax25_list_lock){-+..}, at: [<f91dd3b1>] ax25_destroy_socket+0x171/0x1f0 [ax25]
>
> but task is already holding lock:
> (slock-AF_AX25){-+..}, at: [<f91dbabc>] ax25_std_heartbeat_expiry+0x1c/0xe0 [ax25]
>
> which lock already depends on the new lock.
...
shows that ax25_list_lock and slock-AF_AX25 are taken in different
order: ax25_info_show() takes slock (bh_lock_sock(ax25->sk)) while
ax25_list_lock is held, so reversely to other functions. To fix this
the sock lock should be moved to ax25_info_start(), and there would
be still problem with breaking ax25_list_lock (it seems this "proper"
order isn't optimal yet). But, since it's only for reading proc info
it seems this is not necessary (e.g. ax25_send_to_raw() does similar
reading without this lock too).
So, this patch removes sock lock to avoid deadlock possibility; there
is also used sock_i_ino() function, which reads sk_socket under proper
read lock. Additionally printf format of this i_ino is changed to %lu.
Reported-by: Bernard Pidoux F6BVP <f6bvp@free.fr>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom')
0 files changed, 0 insertions, 0 deletions