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net: devnet_rename_seq should be a seqcount

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Using a seqlock for devnet_rename_seq is not a good idea,
as device_rename() can sleep.

As we hold RTNL, we dont need a protection for writers,
and only need a seqcount so that readers can catch a change done
by a writer.

Bug added in commit c91f6df2db (sockopt: Change getsockopt() of
SO_BINDTODEVICE to return an interface name)

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2012-12-20 17:25:08 +00:00
committed by David S. Miller
parent f7e75ba177
commit 30e6c9fa93
3 changed files with 12 additions and 12 deletions
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2
include/linux/netdevice.h
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@@ -1576,7 +1576,7 @@ extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
extern rwlock_t dev_base_lock; /* Device list lock */
extern seqlock_t devnet_rename_seq; /* Device rename lock */
extern seqcount_t devnet_rename_seq; /* Device rename seq */
#define for_each_netdev(net, d) \