linux-kernel - Re: [PATCH] atm/svc: Fix blocking in wait loop

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Date:	Tue, 12 Aug 2014 15:02:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	chas@....nrl.navy.mil
Cc:	peterz@...radead.org, fengguang.wu@...el.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, lkp@...org,
	linux-atm-general@...ts.sourceforge.net
Subject: Re: [PATCH] atm/svc: Fix blocking in wait loop

From: chas williams - CONTRACTOR <chas@....nrl.navy.mil>
Date: Tue, 12 Aug 2014 08:12:26 -0400

> 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@....n4rl.navy.mil>
> Acked-by: Peter Zijlstra <peterz@...radead.org>

Applied.
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