From 859975764fa61e927e7a69f46a55a4ba415785dd Mon Sep 17 00:00:00 2001
From: Cyrill Gorcunov <gorcunov@openvz.org>
Date: Mon, 12 Jan 2009 22:11:56 -0800
Subject: [PATCH] net: ppp_generic - fix regressions caused by IDR conversion

The commits:

	7a95d267fb62cd6b80ef73be0592bbbe1dbd5df7
	("net: ppp_generic - use idr technique instead of cardmaps")

	ab5024ab23b78c86a0a1425defcdde48710fe449
	("net: ppp_generic - use DEFINE_IDR for static initialization")

introduced usage of IDR functionality but broke userspace side.

Before this commits it was possible to allocate new ppp interface with
specified number. Now it fails with EINVAL.  Fix it by trying to
allocate interface with specified unit number and return EEXIST if
fail which allow pppd to ask us to allocate new unit number.

And fix messages on memory allocation fails - add details that it's
PPP module who is complaining.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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