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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-06-01 00:26:58 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-01 00:26:58 -0700 |
| commit | aac4dddc358acfd9d98b20024a42c34dfab31c39 (patch) | |
| tree | 08c9bb6dcbb45673ded4e63ea676f54f9abf8180 | |
| parent | 95e3bb7aff59d3b6c73d55d1a386ee53b8363fb5 (diff) | |
| download | linux-3.10-aac4dddc358acfd9d98b20024a42c34dfab31c39.tar.gz linux-3.10-aac4dddc358acfd9d98b20024a42c34dfab31c39.tar.bz2 linux-3.10-aac4dddc358acfd9d98b20024a42c34dfab31c39.zip | |
ipv6: get rid of ipip6_prl_lock
As noticed by Julia Lawall, ipip6_tunnel_add_prl() incorrectly calls
kzallloc(..., GFP_KERNEL) while a spinlock is held. She provided
a patch to use GFP_ATOMIC instead.
One possibility would be to convert this spinlock to a mutex, or
preallocate the thing before taking the lock.
After RCU conversion, it appears we dont need this lock, since
caller already holds RTNL
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/sit.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index e51e650ea80..702c532ec21 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -249,8 +249,6 @@ failed: return NULL; } -static DEFINE_SPINLOCK(ipip6_prl_lock); - #define for_each_prl_rcu(start) \ for (prl = rcu_dereference(start); \ prl; \ @@ -340,7 +338,7 @@ ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) if (a->addr == htonl(INADDR_ANY)) return -EINVAL; - spin_lock(&ipip6_prl_lock); + ASSERT_RTNL(); for (p = t->prl; p; p = p->next) { if (p->addr == a->addr) { @@ -370,7 +368,6 @@ ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) t->prl_count++; rcu_assign_pointer(t->prl, p); out: - spin_unlock(&ipip6_prl_lock); return err; } @@ -397,7 +394,7 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) struct ip_tunnel_prl_entry *x, **p; int err = 0; - spin_lock(&ipip6_prl_lock); + ASSERT_RTNL(); if (a && a->addr != htonl(INADDR_ANY)) { for (p = &t->prl; *p; p = &(*p)->next) { @@ -419,7 +416,6 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) } } out: - spin_unlock(&ipip6_prl_lock); return err; } |