From: dann frazier <dannf@hp.com>
Date: Wed, 26 Nov 2008 23:32:27 +0000 (-0800)
Subject: net: Fix soft lockups/OOM issues w/ unix garbage collector
X-Git-Tag: v2.6.28-rc8~73^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f23b734963ec7eaa3ebcd9050da0c9b7d143dd3;p=pandora-kernel.git

net: Fix soft lockups/OOM issues w/ unix garbage collector

This is an implementation of David Miller's suggested fix in:
  https://bugzilla.redhat.com/show_bug.cgi?id=470201

It has been updated to use wait_event() instead of
wait_event_interruptible().

Paraphrasing the description from the above report, it makes sendmsg()
block while UNIX garbage collection is in progress. This avoids a
situation where child processes continue to queue new FDs over a
AF_UNIX socket to a parent which is in the exit path and running
garbage collection on these FDs. This contention can result in soft
lockups and oom-killing of unrelated processes.

Signed-off-by: dann frazier <dannf@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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