From: Arnd Bergmann <arnd@arndb.de>
Date: Sat, 7 Nov 2009 06:52:32 +0000 (-0800)
Subject: net/tun: handle compat_ioctl directly
X-Git-Tag: v2.6.33-rc1~388^2~484
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50857e2a59d8beddc6bb76137df026d67f30d5ca;p=pandora-kernel.git

net/tun: handle compat_ioctl directly

The tun driver is the only code in the kernel that operates
on a character device with struct ifreq. Change the driver
to handle the conversion itself so we can contain the
remaining ifreq handling in the socket layer.

This also fixes a bug in the handling of invalid ioctl
numbers on an unbound tun device. The driver treats this
as a TUNSETIFF in native mode, but there is no way for
the generic compat_ioctl() function to emulate this
behaviour. Possibly the driver was only doing this
accidentally anyway, but if any code relies on this
misfeature, it now also works in compat mode.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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