[This patch series has also been separately sent to the architecture
 maintainers]

Add console_device() to return the console tty driver structure and the
index.  Acquire the console lock while scanning the list of console drivers
to protect us against console driver list manipulations.
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>