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tuntap: switch to use rtnl_dereference() 

Switch to use rtnl_dereference() instead of the open code, suggested by Eric.

Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-01-11 16:59:32 +00:00 committed by David S. Miller
parent d07d7507bf
commit b8deabd3ee
1 changed files with 10 additions and 17 deletions
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27
drivers/net/tun.c
View File

@ -404,8 +404,8 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
struct tun_struct *tun; struct tun_struct *tun;
struct net_device *dev; struct net_device *dev;
tun = rcu_dereference_protected(tfile->tun, tun = rtnl_dereference(tfile->tun);
lockdep_rtnl_is_held());
if (tun) { if (tun) {
u16 index = tfile->queue_index; u16 index = tfile->queue_index;
BUG_ON(index >= tun->numqueues); BUG_ON(index >= tun->numqueues);
@ -414,8 +414,7 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
rcu_assign_pointer(tun->tfiles[index], rcu_assign_pointer(tun->tfiles[index],
tun->tfiles[tun->numqueues - 1]); tun->tfiles[tun->numqueues - 1]);
rcu_assign_pointer(tfile->tun, NULL); rcu_assign_pointer(tfile->tun, NULL);
ntfile = rcu_dereference_protected(tun->tfiles[index], ntfile = rtnl_dereference(tun->tfiles[index]);
lockdep_rtnl_is_held());
ntfile->queue_index = index; ntfile->queue_index = index;
--tun->numqueues; --tun->numqueues;
@ -458,8 +457,7 @@ static void tun_detach_all(struct net_device *dev)
int i, n = tun->numqueues; int i, n = tun->numqueues;
for (i = 0; i < n; i++) { for (i = 0; i < n; i++) {
tfile = rcu_dereference_protected(tun->tfiles[i], tfile = rtnl_dereference(tun->tfiles[i]);
lockdep_rtnl_is_held());
BUG_ON(!tfile); BUG_ON(!tfile);
wake_up_all(&tfile->wq.wait); wake_up_all(&tfile->wq.wait);
rcu_assign_pointer(tfile->tun, NULL); rcu_assign_pointer(tfile->tun, NULL);
@ -469,8 +467,7 @@ static void tun_detach_all(struct net_device *dev)
synchronize_net(); synchronize_net();
for (i = 0; i < n; i++) { for (i = 0; i < n; i++) {
tfile = rcu_dereference_protected(tun->tfiles[i], tfile = rtnl_dereference(tun->tfiles[i]);
lockdep_rtnl_is_held());
/* Drop read queue */ /* Drop read queue */
skb_queue_purge(&tfile->sk.sk_receive_queue); skb_queue_purge(&tfile->sk.sk_receive_queue);
sock_put(&tfile->sk); sock_put(&tfile->sk);
@ -489,7 +486,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
int err; int err;
err = -EINVAL; err = -EINVAL;
if (rcu_dereference_protected(tfile->tun, lockdep_rtnl_is_held())) if (rtnl_dereference(tfile->tun))
goto out; goto out;
if (tfile->detached && tun != tfile->detached) if (tfile->detached && tun != tfile->detached)
goto out; goto out;
@ -1740,8 +1737,7 @@ static void tun_detach_filter(struct tun_struct *tun, int n)
struct tun_file *tfile; struct tun_file *tfile;
for (i = 0; i < n; i++) { for (i = 0; i < n; i++) {
tfile = rcu_dereference_protected(tun->tfiles[i], tfile = rtnl_dereference(tun->tfiles[i]);
lockdep_rtnl_is_held());
sk_detach_filter(tfile->socket.sk); sk_detach_filter(tfile->socket.sk);
} }
@ -1754,8 +1750,7 @@ static int tun_attach_filter(struct tun_struct *tun)
struct tun_file *tfile; struct tun_file *tfile;
for (i = 0; i < tun->numqueues; i++) { for (i = 0; i < tun->numqueues; i++) {
tfile = rcu_dereference_protected(tun->tfiles[i], tfile = rtnl_dereference(tun->tfiles[i]);
lockdep_rtnl_is_held());
ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); ret = sk_attach_filter(&tun->fprog, tfile->socket.sk);
if (ret) { if (ret) {
tun_detach_filter(tun, i); tun_detach_filter(tun, i);
@ -1773,8 +1768,7 @@ static void tun_set_sndbuf(struct tun_struct *tun)
int i; int i;
for (i = 0; i < tun->numqueues; i++) { for (i = 0; i < tun->numqueues; i++) {
tfile = rcu_dereference_protected(tun->tfiles[i], tfile = rtnl_dereference(tun->tfiles[i]);
lockdep_rtnl_is_held());
tfile->socket.sk->sk_sndbuf = tun->sndbuf; tfile->socket.sk->sk_sndbuf = tun->sndbuf;
} }
} }
@ -1794,8 +1788,7 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr)
else else
ret = tun_attach(tun, file); ret = tun_attach(tun, file);
} else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) {
tun = rcu_dereference_protected(tfile->tun, tun = rtnl_dereference(tfile->tun);
lockdep_rtnl_is_held());
if (!tun || !(tun->flags & TUN_TAP_MQ)) if (!tun || !(tun->flags & TUN_TAP_MQ))
ret = -EINVAL; ret = -EINVAL;
else else