[TG3]: Fix 5704 single-port mode

If the dual-port 5704 is configured as a single-port device with
only one PCI function, it would trigger a BUG() condition in
tg3_find_5704_peer(). This fixes the problem by returning its
own pdev if the peer cannot be found.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 6b7ab4b72752..a143c18c7bc6 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -10443,8 +10443,13 @@ static struct pci_dev * __devinit tg3_find_5704_peer(struct tg3 *tp)
                         break;
                 pci_dev_put(peer);
         }
-        if (!peer || peer == tp->pdev)
-                BUG();
+        /* 5704 can be configured in single-port mode, set peer to
+         * tp->pdev in that case.
+         */
+        if (!peer) {
+                peer = tp->pdev;
+                return peer;
+        }
 
         /*
          * We don't need to keep the refcount elevated; there's no way