bcm_proc_getifname() is called with RTNL and dev_base_lock

bcm_proc_getifname() is called with RTNL and dev_base_lock
not held. It calls __dev_get_by_index() without locks, and
this is illegal (might crash)

Close the race by holding dev_base_lock and copying dev->name
in the protected section.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commitdiff;h=6755aebaaf9fc5416acfd4578ab7a1e122ecbc74

git-svn-id: svn://svn.berlios.de//socketcan/trunk@1079 030b6a49-0b11-0410-94ab-b0dab22257f2