aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJeff Garzik <jgarzik@redhat.com>2007-10-08 00:06:32 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:54:49 -0700
commit14e3e07979c4384e45e751882292d3b38477e855 (patch)
treea99004a45287f943ffa69428ceb0d516f1bc9458
parentcfcabdcc2d5a810208e5bb3974121b7ed60119aa (diff)
[NET]: split dev_ifsioc() according to locking
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>
-rw-r--r--net/core/dev.c88
1 files changed, 58 insertions, 30 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 13a1bc5d3bf..1aa07047826 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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)