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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-19 00:39:26 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2010-10-19 03:50:48 -0700 |
| commit | 8723e1b4ad9be4444423b4d41509ce859a629649 (patch) | |
| tree | 00b0121c12e62736807e998b22b8964f1a5e1df9 /net/ipv4/fib_semantics.c | |
| parent | net: avoid a dev refcount in ip_mc_find_dev() (diff) | |
| download | linux-dev-8723e1b4ad9be4444423b4d41509ce859a629649.tar.xz linux-dev-8723e1b4ad9be4444423b4d41509ce859a629649.zip | |
inet: RCU changes in inetdev_by_index()
Convert inetdev_by_index() to not increment in_dev refcount.
Callers hold RCU or RTNL, and should not decrement in_dev refcount.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_semantics.c')
| -rw-r--r-- | net/ipv4/fib_semantics.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 0f80dfc2f7fb..6734c9cab248 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -590,32 +590,29 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi, if (!dev) goto out; dev_hold(dev); - err = -ENETDOWN; - if (!(dev->flags & IFF_UP)) - goto out; - err = 0; -out: - rcu_read_unlock(); - return err; + err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN; } else { struct in_device *in_dev; if (nh->nh_flags & (RTNH_F_PERVASIVE | RTNH_F_ONLINK)) return -EINVAL; + rcu_read_lock(); + err = -ENODEV; in_dev = inetdev_by_index(net, nh->nh_oif); if (in_dev == NULL) - return -ENODEV; - if (!(in_dev->dev->flags & IFF_UP)) { - in_dev_put(in_dev); - return -ENETDOWN; - } + goto out; + err = -ENETDOWN; + if (!(in_dev->dev->flags & IFF_UP)) + goto out; nh->nh_dev = in_dev->dev; dev_hold(nh->nh_dev); nh->nh_scope = RT_SCOPE_HOST; - in_dev_put(in_dev); + err = 0; } - return 0; +out: + rcu_read_unlock(); + return err; } static inline unsigned int fib_laddr_hashfn(__be32 val) |