From: Jack Morgenstein <jackm@dev.mellanox.co.il>
Date: Mon, 26 Nov 2007 08:41:19 +0000 (+0200)
Subject: IPoIB: Fix oops if xmit is called when priv->broadcast is NULL
X-Git-Tag: v2.6.24-rc4~17^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1401b53acc0328d96bacb2a3393d2852699df96b;p=pandora-kernel.git

IPoIB: Fix oops if xmit is called when priv->broadcast is NULL

If a port goes down, ipoib_ib_dev_down() is invoked -- which flushes
the mcasts (clearing priv->broadcast) and clearing the path record
cache.  If ipoib_start_xmit() is then invoked (before the broadcast
group is rejoined), a kernel oops results from attempting to access
priv->broadcast, which is still unset.

Returning NULL from path_rec_create() if priv->broadcast is NULL is a
harmless way of bypassing the problem -- the offending packet is
simply discarded "without prejudice."

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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