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authorHerbert Xu <herbert@gondor.apana.org.au>2007-05-08 18:34:17 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-05-10 23:45:07 -0700
commit572a103ded0ad880f75ce83e99f0512fbb80b5b0 (patch)
treeb469715be284a13c3f603903cc9158baa7baa992 /include
parentc33be3c362f1bc98f6e2d731a274ef138ae80741 (diff)
[NET] link_watch: Move link watch list into net_device
These days the link watch mechanism is an integral part of the network subsystem as it manages the carrier status. So it now makes sense to allocate some memory for it in net_device rather than allocating it on demand. In fact, this is necessary because we can't tolerate a memory allocation failure since that means we'd have to potentially throw a link up event away. It also simplifies the code greatly. In doing so I discovered a subtle race condition in the use of singleevent. This race condition still exists (and is somewhat magnified) without singleevent but it's now plugged thanks to an smp_mb__before_clear_bit. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netdevice.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 30446222b39..f671cd2f133 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -467,6 +467,8 @@ struct net_device
/* device index hash chain */
struct hlist_node index_hlist;
+ struct net_device *link_watch_next;
+
/* register/unregister state machine */
enum { NETREG_UNINITIALIZED=0,
NETREG_REGISTERED, /* completed register_netdevice */