Commit cc1b2ba8 authored by Stephen Hemminger's avatar Stephen Hemminger

[NET]: Move dev_base and dev_base_lock into net/core/dev.c

parent 33be9435
......@@ -430,28 +430,3 @@ static int __init net_olddevs_init(void)
}
device_initcall(net_olddevs_init);
/*
* The @dev_base list is protected by @dev_base_lock and the rtln
* semaphore.
*
* Pure readers hold dev_base_lock for reading.
*
* Writers must hold the rtnl semaphore while they loop through the
* dev_base list, and hold dev_base_lock for writing when they do the
* actual updates. This allows pure readers to access the list even
* while a writer is preparing to update it.
*
* To put it another way, dev_base_lock is held for writing only to
* protect against pure readers; the rtnl semaphore provides the
* protection against other writers.
*
* See, for example usages, register_netdevice() and
* unregister_netdevice(), which must be called with the rtnl
* semaphore held.
*/
struct net_device *dev_base;
rwlock_t dev_base_lock = RW_LOCK_UNLOCKED;
EXPORT_SYMBOL(dev_base);
EXPORT_SYMBOL(dev_base_lock);
......@@ -160,6 +160,31 @@ static void sample_queue(unsigned long dummy);
static struct timer_list samp_timer = TIMER_INITIALIZER(sample_queue, 0, 0);
#endif
/*
* The @dev_base list is protected by @dev_base_lock and the rtln
* semaphore.
*
* Pure readers hold dev_base_lock for reading.
*
* Writers must hold the rtnl semaphore while they loop through the
* dev_base list, and hold dev_base_lock for writing when they do the
* actual updates. This allows pure readers to access the list even
* while a writer is preparing to update it.
*
* To put it another way, dev_base_lock is held for writing only to
* protect against pure readers; the rtnl semaphore provides the
* protection against other writers.
*
* See, for example usages, register_netdevice() and
* unregister_netdevice(), which must be called with the rtnl
* semaphore held.
*/
struct net_device *dev_base;
rwlock_t dev_base_lock = RW_LOCK_UNLOCKED;
EXPORT_SYMBOL(dev_base);
EXPORT_SYMBOL(dev_base_lock);
/*
* Our notifier list
*/
......
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