cxgb3: simplify need_skb_unmap

We can use CONFIG_NEED_DMA_MAP_STATE to see if a platform does real
DMA unmapping.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 9 deletions

diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index 5962b911b5bd..8ff96c6f6de5 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -203,15 +203,11 @@ static inline void refill_rspq(struct adapter *adapter,
  */
 static inline int need_skb_unmap(void)
 {
-        /*
-         * This structure is used to tell if the platform needs buffer
-         * unmapping by checking if DECLARE_PCI_UNMAP_ADDR defines anything.
-         */
-        struct dummy {
-                DEFINE_DMA_UNMAP_ADDR(addr);
-        };
-
-        return sizeof(struct dummy) != 0;
+#ifdef CONFIG_NEED_DMA_MAP_STATE
+        return 1;
+#else
+        return 0;
+#endif
 }
 
 /**