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[NET]: split dev_ifsioc() according to locking

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This always bugged me: dev_ioctl() called dev_ifsioc() either inside
read_lock(dev_base_lock) or rtnl_lock(), depending on the ioctl being
executed.

This change moves the ioctls executed inside dev_base_lock to a new
function, dev_ifsioc_locked().  Now the locking context is completely
clear to the reader.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeff Garzik 2007-10-08 00:06:32 -07:00 committed by David S. Miller
parent cfcabdcc2d
commit 14e3e07979
1 changed files with 58 additions and 30 deletions
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88
net/core/dev.c
View file

@ -3083,9 +3083,9 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
}
/*
* Perform the SIOCxIFxxx calls.
* Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
*/
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
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);
@ -3098,25 +3098,15 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
ifr->ifr_flags = dev_get_flags(dev);
return 0;
case SIOCSIFFLAGS: /* Set interface flags */
return dev_change_flags(dev, ifr->ifr_flags);
case SIOCGIFMETRIC: /* Get the metric on the interface
(currently unused) */
ifr->ifr_metric = 0;
return 0;
case SIOCSIFMETRIC: /* Set the metric on the interface
(currently unused) */
return -EOPNOTSUPP;
case SIOCGIFMTU: /* Get the MTU of a device */
ifr->ifr_mtu = dev->mtu;
return 0;
case SIOCSIFMTU: /* Set the MTU of a device */
return dev_set_mtu(dev, ifr->ifr_mtu);
case SIOCGIFHWADDR:
if (!dev->addr_len)
memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
@ -3126,6 +3116,61 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
ifr->ifr_hwaddr.sa_family = dev->type;
return 0;
case SIOCGIFSLAVE:
err = -EINVAL;
break;
case SIOCGIFMAP:
ifr->ifr_map.mem_start = dev->mem_start;
ifr->ifr_map.mem_end = dev->mem_end;
ifr->ifr_map.base_addr = dev->base_addr;
ifr->ifr_map.irq = dev->irq;
ifr->ifr_map.dma = dev->dma;
ifr->ifr_map.port = dev->if_port;
return 0;
case SIOCGIFINDEX:
ifr->ifr_ifindex = dev->ifindex;
return 0;
case SIOCGIFTXQLEN:
ifr->ifr_qlen = dev->tx_queue_len;
return 0;
default:
/* dev_ioctl() should ensure this case
* is never reached
*/
WARN_ON(1);
err = -EINVAL;
break;
}
return err;
}
/*
* Perform the SIOCxIFxxx calls, inside rtnl_lock()
*/
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
int err;
struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
if (!dev)
return -ENODEV;
switch (cmd) {
case SIOCSIFFLAGS: /* Set interface flags */
return dev_change_flags(dev, ifr->ifr_flags);
case SIOCSIFMETRIC: /* Set the metric on the interface
(currently unused) */
return -EOPNOTSUPP;
case SIOCSIFMTU: /* Set the MTU of a device */
return dev_set_mtu(dev, ifr->ifr_mtu);
case SIOCSIFHWADDR:
return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
@ -3137,15 +3182,6 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
return 0;
case SIOCGIFMAP:
ifr->ifr_map.mem_start = dev->mem_start;
ifr->ifr_map.mem_end = dev->mem_end;
ifr->ifr_map.base_addr = dev->base_addr;
ifr->ifr_map.irq = dev->irq;
ifr->ifr_map.dma = dev->dma;
ifr->ifr_map.port = dev->if_port;
return 0;
case SIOCSIFMAP:
if (dev->set_config) {
if (!netif_device_present(dev))
@ -3172,14 +3208,6 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
dev->addr_len, 1);
case SIOCGIFINDEX:
ifr->ifr_ifindex = dev->ifindex;
return 0;
case SIOCGIFTXQLEN:
ifr->ifr_qlen = dev->tx_queue_len;
return 0;
case SIOCSIFTXQLEN:
if (ifr->ifr_qlen < 0)
return -EINVAL;
@ -3290,7 +3318,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
case SIOCGIFTXQLEN:
dev_load(net, ifr.ifr_name);
read_lock(&dev_base_lock);
ret = dev_ifsioc(net, &ifr, cmd);
ret = dev_ifsioc_locked(net, &ifr, cmd);
read_unlock(&dev_base_lock);
if (!ret) {
if (colon)