netdev - Re: [PATCH net-next-2.6 1/2] 3c59x: Specify window explicitly for access to windowed registers

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Date:	Mon, 28 Jun 2010 23:20:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ben@...adent.org.uk
Cc:	netdev@...r.kernel.org, chase.douglas@...onical.com,
	nordmark@...h.kth.se
Subject: Re: [PATCH net-next-2.6 1/2] 3c59x: Specify window explicitly for
 access to windowed registers

From: Ben Hutchings <ben@...adent.org.uk>
Date: Thu, 24 Jun 2010 00:54:31 +0100

> Currently much of the code assumes that a specific window has been
> selected, while a few functions save and restore the window.  This
> makes it impossible to introduce fine-grained locking.
> 
> Make those assumptions explicit by introducing wrapper functions
> to set the window and read/write a register.  Use these everywhere
> except vortex_interrupt(), vortex_start_xmit() and vortex_rx().
> These set the window just once, or not at all in the case of
> vortex_rx() as it should always be called from vortex_interrupt().
> 
> Cache the current window in struct vortex_private to avoid
> unnecessary hardware writes.
> 
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> Tested-by: Arne Nordmark <nordmark@...h.kth.se> [against 2.6.32]

Applied.
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