From: Ben Hutchings <ben@decadent.org.uk>
Date: Wed, 23 Jun 2010 13:54:31 +0000 (+0000)
Subject: 3c59x: Specify window explicitly for access to windowed registers
X-Git-Tag: v2.6.36-rc1~571^2~444
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a095cfc40ec7ebe63e9532383c5b5c2a27b14075;p=pandora-kernel.git

3c59x: Specify window explicitly for access to windowed registers

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@decadent.org.uk>
Tested-by: Arne Nordmark <nordmark@mech.kth.se> [against 2.6.32]
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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