NAME
__dev_get_by_index - find a device by its ifindex
SYNOPSIS
struct net_device * __dev_get_by_index (int ifindex);
ARGUMENTS
ifindex
index of device
DESCRIPTION
Search for an interface by index. Returns NULL if the device is not
found or a pointer to the device. The device has not had its reference
counter increased so the caller must be careful about locking. The
caller must hold either the RTNL semaphore or dev_base_lock.