sky2: prevent dual port receiver problems

When both ports are receiving simultaneously, the receive logic gets confused
and may pass up a packet before it is full. This causes hangs, and IP will see
lots of garbage packets. There is even the potential for data corruption if
a later arriving packet DMA's into freed memory.

It looks like a hardware bug because status arrives for a packet but no
data is there. Until this bug is worked out, block the user from bringing
up both ports at once.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index ffd267fab21d..62be6d99d05c 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1020,8 +1020,19 @@ static int sky2_up(struct net_device *dev)
         struct sky2_hw *hw = sky2->hw;
         unsigned port = sky2->port;
         u32 ramsize, rxspace, imask;
-        int err = -ENOMEM;
+        int err;
+        struct net_device *otherdev = hw->dev[sky2->port^1];
 
+        /* Block bringing up both ports at the same time on a dual port card.
+         * There is an unfixed bug where receiver gets confused and picks up
+         * packets out of order. Until this is fixed, prevent data corruption.
+         */
+        if (otherdev && netif_running(otherdev)) {
+                printk(KERN_INFO PFX "dual port support is disabled.\n");
+                return -EBUSY;
+        }
+
+        err = -ENOMEM;
         if (netif_msg_ifup(sky2))
                 printk(KERN_INFO PFX "%s: enabling interface\n", dev->name);