From: Patrick McHardy <kaber@trash.net>
Date: Mon, 12 Feb 2007 19:09:55 +0000 (-0800)
Subject: [NETFILTER]: Switch nf_register_afinfo/nf_unregister_afinfo to mutex
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d486dd1fb8573fad5b8dab61a7d1406116fd4baf;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

[NETFILTER]: Switch nf_register_afinfo/nf_unregister_afinfo 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>
---

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index a66bd6af44f..716603f05c0 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -22,29 +22,34 @@
 #include <linux/netdevice.h>
 #include <linux/inetdevice.h>
 #include <linux/proc_fs.h>
+#include <linux/mutex.h>
 #include <net/sock.h>
 
 #include "nf_internals.h"
 
-static DEFINE_SPINLOCK(afinfo_lock);
+static DEFINE_MUTEX(afinfo_mutex);
 
 struct nf_afinfo *nf_afinfo[NPROTO] __read_mostly;
 EXPORT_SYMBOL(nf_afinfo);
 
 int nf_register_afinfo(struct nf_afinfo *afinfo)
 {
-	spin_lock(&afinfo_lock);
+	int err;
+
+	err = mutex_lock_interruptible(&afinfo_mutex);
+	if (err < 0)
+		return err;
 	rcu_assign_pointer(nf_afinfo[afinfo->family], afinfo);
-	spin_unlock(&afinfo_lock);
+	mutex_unlock(&afinfo_mutex);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nf_register_afinfo);
 
 void nf_unregister_afinfo(struct nf_afinfo *afinfo)
 {
-	spin_lock(&afinfo_lock);
+	mutex_lock(&afinfo_mutex);
 	rcu_assign_pointer(nf_afinfo[afinfo->family], NULL);
-	spin_unlock(&afinfo_lock);
+	mutex_unlock(&afinfo_mutex);
 	synchronize_rcu();
 }
 EXPORT_SYMBOL_GPL(nf_unregister_afinfo);