tg3: fix ring init when there are more TX than RX channels

[ Upstream commit a620a6bc1c94c22d6c312892be1e0ae171523125 ]

If TX channels are set to 4 and RX channels are set to less than 4,
using ethtool -L, the driver will try to initialize more RX channels
than it has allocated, causing an oops.

This fix only initializes the RX ring if it has been allocated.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 3de4069f020e35da50f4e547c5b79edbeb9a44e9..5501cad30cfa94207deaf0b2a5bbcfb01fa7cc89 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -8392,7 +8392,8 @@ static int tg3_init_rings(struct tg3 *tp)
                if (tnapi->rx_rcb)
                        memset(tnapi->rx_rcb, 0, TG3_RX_RCB_RING_BYTES(tp));
 
-               if (tg3_rx_prodring_alloc(tp, &tnapi->prodring)) {
+               if (tnapi->prodring.rx_std &&
+                   tg3_rx_prodring_alloc(tp, &tnapi->prodring)) {
                        tg3_free_rings(tp);
                        return -ENOMEM;
                }