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