[TG3]: TSO workaround fixes.

1.  Add race condition check after netif_stop_queue().  tg3_tx() runs
    without netif_tx_lock and can race with tg3_start_xmit_dma_bug() ->
    tg3_tso_bug().

2.  Firmware TSO in 5703/5704/5705 also have the same TSO limitation,
    i.e. they cannot handle TSO headers bigger than 80 bytes.  Rename
    TG3_FL2_HW_TSO_1_BUG to TG3_FL2_TSO_BUG and set this flag on
    these chips as well.

3.  Update version to 3.74.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 45d477e..086892d 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2227,7 +2227,7 @@
 #define TG3_FLAG_INIT_COMPLETE		0x80000000
 	u32				tg3_flags2;
 #define TG3_FLG2_RESTART_TIMER		0x00000001
-#define TG3_FLG2_HW_TSO_1_BUG		0x00000002
+#define TG3_FLG2_TSO_BUG		0x00000002
 #define TG3_FLG2_NO_ETH_WIRE_SPEED	0x00000004
 #define TG3_FLG2_IS_5788		0x00000008
 #define TG3_FLG2_MAX_RXPEND_64		0x00000010