isdn_net_get_locked_lp is doing a local_bh_enable with hard IRQs disabled. 
This is not allowed.

The following patch fixes the problem by removing the unnecessary
local_bh_enable while the hard IRQs are disabled.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>