netdev - Re: [net-next 02/16] ixgbe: fix spinlock recursion with netpoll and busy poll

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Message-Id: <20140314.175307.982881304181108101.davem@davemloft.net>
Date:	Fri, 14 Mar 2014 17:53:07 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	emil.s.tantilov@...el.com
Cc:	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com, asharma@...com,
	stable@...r.kernel.org, jacob.e.keller@...el.com
Subject: Re: [net-next 02/16] ixgbe: fix spinlock recursion with netpoll
 and busy poll

From: "Tantilov, Emil S" <emil.s.tantilov@...el.com>
Date: Fri, 14 Mar 2014 20:40:25 +0000

> I noticed Eric's patches and this is obviously the better way to
> deal with it, but once the netpoll_rx patches are accepted will they
> make it into previous stable releases? Currently kernels between
> 3.11 and 3.13 (assuming Eric's changes make it into 3.14) will hang
> when netpoll and busy poll are used together.

This is very likely.

And in any event, solving it only in specific drivers is not the way
to go about things.
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