This is from Gerd Knorr.  It fixes a network hang caused by the host side of
an interface being full when the UML interface is brought up, preventing any
SIGIOs from happening.  It also implements an ioctl needed for ethtool.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>