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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-11-01 20:42:09 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-02 08:55:11 +0100 |
| commit | 3710becf8a58a5c6c4e797e3a3c968c161abdb41 (patch) | |
| tree | 8206fd7c4508d8eb16f0d00fc1e7437110f938b7 /net | |
| parent | icmp: icmp_send() can avoid a dev_put() (diff) | |
| download | linux-3710becf8a58a5c6c4e797e3a3c968c161abdb41.tar.xz linux-3710becf8a58a5c6c4e797e3a3c968c161abdb41.zip | |
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.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 3c40d545a035..76a1502efe67 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 = ':'; |