From: Juergen Gross <jgross@suse.com>
Date: Thu, 26 Feb 2015 05:52:05 +0000 (+0100)
Subject: xen/events: avoid NULL pointer dereference in dom0 on large machines
X-Git-Tag: omap-for-v4.1/wl12xx-dt~18^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85e40b0539b24518c8bdf63e2605c8522377d00f;p=pandora-kernel.git

xen/events: avoid NULL pointer dereference in dom0 on large machines

Using the pvops kernel a NULL pointer dereference was detected on a
large machine (144 processors) when booting as dom0 in
evtchn_fifo_unmask() during assignment of a pirq.

The event channel in question was the first to need a new entry in
event_array[] in events_fifo.c. Unfortunately xen_irq_info_pirq_setup()
is called with evtchn being 0 for a new pirq and the real event channel
number is assigned to the pirq only during __startup_pirq().

It is mandatory to call xen_evtchn_port_setup() after assigning the
event channel number to the pirq to make sure all memory needed for the
event channel is allocated.

Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: <stable@vger.kernel.org> # 3.14+
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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