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Subject[PATCH] (4/8) Eliminate brlock in net/bridge
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Eliminate brlock in bridge code.

diff -urN -X dontdiff linux-2.5.64/net/bridge/br.c linux-2.5-nobrlock/net/bridge/br.c
--- linux-2.5.64/net/bridge/br.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/bridge/br.c 2003-03-10 15:49:15.000000000 -0800
@@ -21,7 +21,6 @@
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/if_bridge.h>
-#include <linux/brlock.h>
#include <asm/uaccess.h>
#include "br_private.h"

@@ -73,14 +72,15 @@
unregister_netdevice_notifier(&br_device_notifier);
br_call_ioctl_atomic(__br_clear_ioctl_hook);

- br_write_lock_bh(BR_NETPROTO_LOCK);
br_handle_frame_hook = NULL;
- br_write_unlock_bh(BR_NETPROTO_LOCK);

#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
br_fdb_get_hook = NULL;
br_fdb_put_hook = NULL;
#endif
+
+ /* netif_receive_skb uses RCU */
+ synchronize_kernel();
}

EXPORT_SYMBOL(br_should_route_hook);
diff -urN -X dontdiff linux-2.5.64/net/bridge/br_if.c linux-2.5-nobrlock/net/bridge/br_if.c
--- linux-2.5.64/net/bridge/br_if.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/bridge/br_if.c 2003-03-10 15:50:54.000000000 -0800
@@ -18,7 +18,6 @@
#include <linux/if_bridge.h>
#include <linux/inetdevice.h>
#include <linux/rtnetlink.h>
-#include <linux/brlock.h>
#include <asm/uaccess.h>
#include "br_private.h"

@@ -87,12 +86,11 @@

static void del_ifs(struct net_bridge *br)
{
- br_write_lock_bh(BR_NETPROTO_LOCK);
write_lock(&br->lock);
while (br->port_list != NULL)
__br_del_if(br, br->port_list->dev);
write_unlock(&br->lock);
- br_write_unlock_bh(BR_NETPROTO_LOCK);
+ synchronize_kernel();
}

static struct net_bridge *new_nb(char *name)
@@ -257,13 +255,12 @@
{
int retval;

- br_write_lock_bh(BR_NETPROTO_LOCK);
write_lock(&br->lock);
retval = __br_del_if(br, dev);
br_stp_recalculate_bridge_id(br);
write_unlock(&br->lock);
- br_write_unlock_bh(BR_NETPROTO_LOCK);

+ synchronize_kernel();
return retval;
}

diff -urN -X dontdiff linux-2.5.64/net/bridge/netfilter/ebtable_broute.c linux-2.5-nobrlock/net/bridge/netfilter/ebtable_broute.c
--- linux-2.5.64/net/bridge/netfilter/ebtable_broute.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/bridge/netfilter/ebtable_broute.c 2003-03-11 15:04:04.000000000 -0800
@@ -14,7 +14,6 @@
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/module.h>
#include <linux/if_bridge.h>
-#include <linux/brlock.h>

// EBT_ACCEPT means the frame will be bridged
// EBT_DROP means the frame will be routed
@@ -68,18 +67,17 @@
ret = ebt_register_table(&broute_table);
if (ret < 0)
return ret;
- br_write_lock_bh(BR_NETPROTO_LOCK);
// see br_input.c
br_should_route_hook = ebt_broute;
- br_write_unlock_bh(BR_NETPROTO_LOCK);
+ synchronize_kernel();
+
return ret;
}

static void __exit fini(void)
{
- br_write_lock_bh(BR_NETPROTO_LOCK);
br_should_route_hook = NULL;
- br_write_unlock_bh(BR_NETPROTO_LOCK);
+ synchronize_kernel();
ebt_unregister_table(&broute_table);
}



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