diff mbox

[net-next-2.6] net: RCU locking for simple ioctl()

Message ID 4AEE7131.601@gmail.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Eric Dumazet Nov. 2, 2009, 5:42 a.m. UTC 
All ioctls() implemented by dev_ifsioc_locked() :
SIOCGIFFLAGS, SIOCGIFMETRIC, SIOCGIFMTU, SIOCGIFHWADDR,
SIOCGIFSLAVE, SIOCGIFMAP, SIOCGIFINDEX & SIOCGIFTXQLEN
can use RCU lock instead of dev_base_lock rwlock

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
 net/core/dev.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

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Comments

David Miller Nov. 2, 2009, 7:57 a.m. UTC | #1 
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 02 Nov 2009 06:42:09 +0100

> All ioctls() implemented by dev_ifsioc_locked() :
> SIOCGIFFLAGS, SIOCGIFMETRIC, SIOCGIFMTU, SIOCGIFHWADDR,
> SIOCGIFSLAVE, SIOCGIFMAP, SIOCGIFINDEX & SIOCGIFTXQLEN
> can use RCU lock instead of dev_base_lock rwlock
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Applied.
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diff mbox

Patch

diff --git a/net/core/dev.c b/net/core/dev.c
index f54d8b8..c0f27ad 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4315,12 +4315,12 @@  int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
 EXPORT_SYMBOL(dev_set_mac_address);
 
 /*
- *	Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
+ *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
  */
 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
 {
 	int err;
-	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
 
 	if (!dev)
 		return -ENODEV;
@@ -4552,9 +4552,9 @@  int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 	case SIOCGIFINDEX:
 	case SIOCGIFTXQLEN:
 		dev_load(net, ifr.ifr_name);
-		read_lock(&dev_base_lock);
+		rcu_read_lock();
 		ret = dev_ifsioc_locked(net, &ifr, cmd);
-		read_unlock(&dev_base_lock);
+		rcu_read_unlock();
 		if (!ret) {
 			if (colon)
 				*colon = ':';