defxx: Disable DEFEA's ESIC I/O decoding on shutdown

Make sure the option card does not respond after shutdown by disabling
it via ESIC's Expansion Board Control register.  Also disable memory and
port I/O decoders, the latter in particular to disable slot-specific I/O
decoding that otherwise remains active even in the board is disabled.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/fddi/defxx.c b/drivers/net/fddi/defxx.c
index 75d54ea72c56..d057d9c2cf5e 100644
--- a/drivers/net/fddi/defxx.c
+++ b/drivers/net/fddi/defxx.c
@@ -856,6 +856,12 @@ static void dfx_bus_uninit(struct net_device *dev)
                 val = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
                 val &= ~PI_CONFIG_STAT_0_M_INT_ENB;
                 outb(val, base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
+
+                /* Disable the board.  */
+                outb(0, base_addr + PI_ESIC_K_SLOT_CNTRL);
+
+                /* Disable memory and port decoders.  */
+                outb(0, base_addr + PI_ESIC_K_FUNCTION_CNTRL);
         }
         if (dfx_bus_pci) {
                 /* Disable interrupts at PCI bus interface chip (PFI) */