[PATCH] netpoll: fix up trapped logic

[PATCH] netpoll: fix up trapped logic

This patch contains the updates necessary to fix the hangs in netconsole.
This includes the changing of trapped to an atomic_t, and the addition of a
netpoll_poll_lock.  It also turns dev->netpoll_rx into a bitfield which is
used to keep from running the networking code from the netpoll_poll call path.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>