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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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4
net/core/sock.c
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@@ -583,7 +583,7 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
goto out;
retry:
seq = read_seqbegin(&devnet_rename_seq);
seq = read_seqcount_begin(&devnet_rename_seq);
rcu_read_lock();
dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
ret = -ENODEV;
@@ -594,7 +594,7 @@ retry:
strcpy(devname, dev->name);
rcu_read_unlock();
if (read_seqretry(&devnet_rename_seq, seq))
if (read_seqcount_retry(&devnet_rename_seq, seq))
goto retry;
len = strlen(devname) + 1;