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| author | Patrick McHardy <kaber@trash.net> | 2007-02-12 11:11:39 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-02-12 11:11:39 -0800 |
| commit | 9b73534dc57fa2fd5ef567586adb83c16e88a52f (patch) | |
| tree | 7ebf77f9dc34f06acfac126ce496442a5735625e | |
| parent | 9dc6aa5fcfc104becd86c89c5e7ec90e840e0163 (diff) | |
| download | linux-9b73534dc57fa2fd5ef567586adb83c16e88a52f.tar.bz2 | |
[NETFILTER]: nf_log: switch logger registration/unregistration to mutex
The spinlock is only used in process context (register/unregister),
switch to a mutex.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/netfilter/nf_log.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index 814bab700db6..243d66b1c02c 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -15,27 +15,31 @@ #define NF_LOG_PREFIXLEN 128 static struct nf_logger *nf_logging[NPROTO]; /* = NULL */ -static DEFINE_SPINLOCK(nf_log_lock); +static DEFINE_MUTEX(nf_log_mutex); /* return EBUSY if somebody else is registered, EEXIST if the same logger * is registred, 0 on success. */ int nf_log_register(int pf, struct nf_logger *logger) { - int ret = -EBUSY; + int ret; if (pf >= NPROTO) return -EINVAL; /* Any setup of logging members must be done before * substituting pointer. */ - spin_lock(&nf_log_lock); - if (!nf_logging[pf]) { + ret = mutex_lock_interruptible(&nf_log_mutex); + if (ret < 0) + return ret; + + if (!nf_logging[pf]) rcu_assign_pointer(nf_logging[pf], logger); - ret = 0; - } else if (nf_logging[pf] == logger) + else if (nf_logging[pf] == logger) ret = -EEXIST; + else + ret = -EBUSY; - spin_unlock(&nf_log_lock); + mutex_unlock(&nf_log_mutex); return ret; } EXPORT_SYMBOL(nf_log_register); @@ -44,9 +48,9 @@ void nf_log_unregister_pf(int pf) { if (pf >= NPROTO) return; - spin_lock(&nf_log_lock); + mutex_lock(&nf_log_mutex); rcu_assign_pointer(nf_logging[pf], NULL); - spin_unlock(&nf_log_lock); + mutex_unlock(&nf_log_mutex); /* Give time to concurrent readers. */ synchronize_rcu(); @@ -57,12 +61,12 @@ void nf_log_unregister_logger(struct nf_logger *logger) { int i; - spin_lock(&nf_log_lock); + mutex_lock(&nf_log_mutex); for (i = 0; i < NPROTO; i++) { if (nf_logging[i] == logger) rcu_assign_pointer(nf_logging[i], NULL); } - spin_unlock(&nf_log_lock); + mutex_unlock(&nf_log_mutex); synchronize_rcu(); } |