Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Subject | [PATCH 2.5.66] sychronize_net patch (1/2) | From | Stephen Hemminger <> | Date | 31 Mar 2003 15:12:58 -0800 |
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Several places are all doing the same thing to synchronize with network receive BH. This patch for 2.5.66 moves this into a new function synchronize_net.
By putting it in one place, it gets the brlock semantics out of several places. The motivation is that eventually on 2.5 based kernels the function can call synchronize_kernel for RCU but leave the 2.4 code alone.
diff -urN -X dontdiff linux-2.4/include/linux/netdevice.h linux-2.4-netsync/include/linux/netdevice.h --- linux-2.4/include/linux/netdevice.h 2003-03-31 11:09:07.000000000 -0800 +++ linux-2.4-netsync/include/linux/netdevice.h 2003-03-31 06:25:34.000000000 -0800 @@ -474,6 +474,7 @@ extern int dev_queue_xmit(struct sk_buff *skb); extern int register_netdevice(struct net_device *dev); extern int unregister_netdevice(struct net_device *dev); +extern void synchronize_net(void); extern int register_netdevice_notifier(struct notifier_block *nb); extern int unregister_netdevice_notifier(struct notifier_block *nb); extern int dev_new_index(void); diff -urN -X dontdiff linux-2.4/net/core/dev.c linux-2.4-netsync/net/core/dev.c --- linux-2.4/net/core/dev.c 2003-03-31 11:09:09.000000000 -0800 +++ linux-2.4-netsync/net/core/dev.c 2003-03-31 14:26:11.000000000 -0800 @@ -2508,6 +2508,12 @@ return 0; } +/* Synchronize with packet receive processing. */ +void synchronize_net() { + br_write_lock_bh(BR_NETPROTO_LOCK); + br_write_unlock_bh(BR_NETPROTO_LOCK); +} + /** * unregister_netdevice - remove device from the kernel * @dev: device @@ -2547,9 +2553,7 @@ return -ENODEV; } - /* Synchronize to net_rx_action. */ - br_write_lock_bh(BR_NETPROTO_LOCK); - br_write_unlock_bh(BR_NETPROTO_LOCK); + synchronize_net(); if (dev_boot_phase == 0) { #ifdef CONFIG_NET_FASTROUTE diff -urN -X dontdiff linux-2.4/net/netsyms.c linux-2.4-netsync/net/netsyms.c --- linux-2.4/net/netsyms.c 2003-03-31 11:09:08.000000000 -0800 +++ linux-2.4-netsync/net/netsyms.c 2003-03-31 06:25:34.000000000 -0800 @@ -478,6 +478,7 @@ EXPORT_SYMBOL(loopback_dev); EXPORT_SYMBOL(register_netdevice); EXPORT_SYMBOL(unregister_netdevice); +EXPORT_SYMBOL(synchronize_net); EXPORT_SYMBOL(netdev_state_change); EXPORT_SYMBOL(dev_new_index); EXPORT_SYMBOL(dev_get_by_index);
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