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Commit 6756ae4b authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[NET]: Convert RTNL to mutex. 



This patch turns the RTNL from a semaphore to a new 2.6.16 mutex and
gets rid of some of the leftover legacy.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 253aa115

drivers/net/8139too.c

+1 −1
Original line number Diff line number Diff line
@@ -1605,7 +1605,7 @@ static void rtl8139_thread (void *_data) 
	if (tp->watchdog_fired) {

		tp->watchdog_fired = 0;

		rtl8139_tx_timeout_task(_data);

	} else if (rtnl_shlock_nowait() == 0) {

	} else if (rtnl_trylock()) {

		rtl8139_thread_iter (dev, tp, tp->mmio_addr);

		rtnl_unlock ();

	} else {

include/linux/rtnetlink.h

+7 −13
Original line number Diff line number Diff line
@@ -907,6 +907,7 @@ struct tcamsg 
#ifdef __KERNEL__



#include <linux/config.h>

#include <linux/mutex.h>



extern size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size);

static __inline__ int rtattr_strcmp(const struct rtattr *rta, const char *str)
@@ -1038,24 +1039,17 @@ __rta_reserve(struct sk_buff *skb, int attrtype, int attrlen) 


extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);



extern struct semaphore rtnl_sem;



#define rtnl_shlock()		down(&rtnl_sem)

#define rtnl_shlock_nowait()	down_trylock(&rtnl_sem)



#define rtnl_shunlock()	do { up(&rtnl_sem); \

		             if (rtnl && rtnl->sk_receive_queue.qlen) \

				     rtnl->sk_data_ready(rtnl, 0); \

		        } while(0)



/* RTNL is used as a global lock for all changes to network configuration  */

extern void rtnl_lock(void);

extern int rtnl_lock_interruptible(void);

extern void rtnl_unlock(void);

extern int rtnl_trylock(void);



extern void rtnetlink_init(void);

extern void __rtnl_unlock(void);



#define ASSERT_RTNL() do { \

	if (unlikely(down_trylock(&rtnl_sem) == 0)) { \

		up(&rtnl_sem); \

	if (unlikely(rtnl_trylock())) { \

		rtnl_unlock(); \

		printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \

		       __FILE__,  __LINE__); \

		dump_stack(); \

net/core/dev.c

+4 −4
Original line number Diff line number Diff line
@@ -2466,9 +2466,9 @@ int dev_ioctl(unsigned int cmd, void __user *arg) 
	 */



	if (cmd == SIOCGIFCONF) {

		rtnl_shlock();

		rtnl_lock();

		ret = dev_ifconf((char __user *) arg);

		rtnl_shunlock();

		rtnl_unlock();

		return ret;

	}

	if (cmd == SIOCGIFNAME)
@@ -2877,7 +2877,7 @@ static void netdev_wait_allrefs(struct net_device *dev) 
	rebroadcast_time = warning_time = jiffies;

	while (atomic_read(&dev->refcnt) != 0) {

		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {

			rtnl_shlock();

			rtnl_lock();



			/* Rebroadcast unregister notification */

			notifier_call_chain(&netdev_chain,
@@ -2894,7 +2894,7 @@ static void netdev_wait_allrefs(struct net_device *dev) 
				linkwatch_run_queue();

			}



			rtnl_shunlock();

			__rtnl_unlock();



			rebroadcast_time = jiffies;

		}

net/core/link_watch.c

+2 −2
Original line number Diff line number Diff line
@@ -139,9 +139,9 @@ static void linkwatch_event(void *dummy) 
	linkwatch_nextevent = jiffies + HZ;

	clear_bit(LW_RUNNING, &linkwatch_flags);



	rtnl_shlock();

	rtnl_lock();

	linkwatch_run_queue();

	rtnl_shunlock();

	rtnl_unlock();

}

net/core/netpoll.c

+3 −3
Original line number Diff line number Diff line
@@ -669,14 +669,14 @@ int netpoll_setup(struct netpoll *np) 
		printk(KERN_INFO "%s: device %s not up yet, forcing it\n",

		       np->name, np->dev_name);



		rtnl_shlock();

		rtnl_lock();

		if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {

			printk(KERN_ERR "%s: failed to open %s\n",

			       np->name, np->dev_name);

			rtnl_shunlock();

			rtnl_unlock();

			goto release;

		}

		rtnl_shunlock();

		rtnl_unlock();



		atleast = jiffies + HZ/10;

 		atmost = jiffies + 4*HZ;