From: chas williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Date: Tue, 12 Aug 2014 12:12:26 +0000 (-0400)
Subject: atm/svc: Fix blocking in wait loop
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~59^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de713b57947a7a1b9cc605c0296ee14065cd86b6;p=pandora-kernel.git

atm/svc: Fix blocking in wait loop

One should not call blocking primitives inside a wait loop, since both
require task_struct::state to sleep, so the inner will destroy the
outer state.

sigd_enq() will possibly sleep for alloc_skb().  Move sigd_enq() before
prepare_to_wait() to avoid sleeping while waiting interruptibly.  You do
not actually need to call sigd_enq() after the initial prepare_to_wait()
because we test the termination condition before calling schedule().

Based on suggestions from Peter Zijlstra.

Signed-off-by: Chas Williams <chas@cmf.n4rl.navy.mil>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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