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[PATCH] lockdep: annotate af_unix locking 

Teach special (recursive) locking code to the lock validator.  Also splits
af_unix's sk_receive_queue.lock class from the other networking skb-queue
locks.  Has no effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-03 00:25:12 -07:00 committed by Linus Torvalds
parent da21f24dd7
commit a09785a241
2 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/af_unix.h
View File

@ -67,6 +67,9 @@ struct unix_skb_parms {
#define unix_state_rlock(s) spin_lock(&unix_sk(s)->lock)
#define unix_state_runlock(s) spin_unlock(&unix_sk(s)->lock)
#define unix_state_wlock(s) spin_lock(&unix_sk(s)->lock)
#define unix_state_wlock_nested(s) \
spin_lock_nested(&unix_sk(s)->lock, \
SINGLE_DEPTH_NESTING)
#define unix_state_wunlock(s) spin_unlock(&unix_sk(s)->lock)
#ifdef __KERNEL__

12
net/unix/af_unix.c
View File

@ -565,6 +565,14 @@ static struct proto unix_proto = {
.obj_size = sizeof(struct unix_sock),
};
/*
* AF_UNIX sockets do not interact with hardware, hence they
* dont trigger interrupts - so it's safe for them to have
* bh-unsafe locking for their sk_receive_queue.lock. Split off
* this special lock-class by reinitializing the spinlock key:
*/
static struct lock_class_key af_unix_sk_receive_queue_lock_key;
static struct sock * unix_create1(struct socket *sock)
{
struct sock *sk = NULL;
@ -580,6 +588,8 @@ static struct sock * unix_create1(struct socket *sock)
atomic_inc(&unix_nr_socks);
sock_init_data(sock,sk);
lockdep_set_class(&sk->sk_receive_queue.lock,
&af_unix_sk_receive_queue_lock_key);
sk->sk_write_space = unix_write_space;
sk->sk_max_ack_backlog = sysctl_unix_max_dgram_qlen;
@ -1045,7 +1055,7 @@ restart:
goto out_unlock;
}
unix_state_wlock(sk);
unix_state_wlock_nested(sk);
if (sk->sk_state != st) {
unix_state_wunlock(sk);