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authorEric Dumazet <eric.dumazet@gmail.com>2009-11-01 19:42:09 +0000
committerDavid S. Miller <davem@davemloft.net>2009-11-01 23:55:11 -0800
commit3710becf8a58a5c6c4e797e3a3c968c161abdb41 (patch)
tree8206fd7c4508d8eb16f0d00fc1e7437110f938b7 /net
parent685c7944055b9de51ff509719070afae92b3dbe1 (diff)
downloadlinux-2.6.34-ux500-3710becf8a58a5c6c4e797e3a3c968c161abdb41.tar.gz
net: RCU locking for simple ioctl()
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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 3c40d545a03..76a1502efe6 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 = ':';