via-velocity: dont oops on MTU change (resend)

via-velocity: dont oops on MTU change (resend)

2.6.22-stable review patch.  If anyone has any objections, please let us
know.

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From: Stephen Hemminger <shemminger@linux-foundation.org>

mainline: 48f6b053613b62fed7a2fe3255e5568260a8d615

The VIA veloicty driver needs the following to allow changing MTU when down.
The buffer size needs to be computed when device is brought up, not when
device is initialized.  This also fixes a bug where the buffer size was
computed differently on change_mtu versus initial setting.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Acked-by: Jeff Mahoney <jeffm@suse.com>
CC: Oliver Pinter <oliver.pntr@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>