linux-kernel - Re: [PATCH 6/6]: powerpc/cell spidernet refine locking

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Date:	Fri, 29 Sep 2006 19:47:52 -0700
From:	Andrew Morton <akpm@...l.org>
To:	linas@...tin.ibm.com (Linas Vepstas)
Cc:	jeff@...zik.org, netdev@...r.kernel.org,
	James K Lewis <jklewis@...ibm.com>,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 6/6]: powerpc/cell spidernet refine locking

On Fri, 29 Sep 2006 18:29:11 -0500
linas@...tin.ibm.com (Linas Vepstas) wrote:

> The transmit side of the spider ethernet driver currently
> places locks around some very large chunks of code. This
> results in a fair amount of lock contention is some cases. 
> This patch makes the locks much more fine-grained, protecting
> only the cirtical sections. One lock is used to protect 
> three locations: the queue head and tail pointers, and the 
> queue low-watermark location.

You have spider_net_set_low_watermark() walking the tx_chain outside
tx_chain.lock.  Are you sure about that?
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