[patch 1/2 -next] cxgb4: clean up a type issue

[Dan Carpenter <dan.carpenter@oracle.com>]

The tx_desc struct hold 8 __be64 values.  The original code took a
tx_desc pointer then casted it to an int pointer and then casted it to a
u64 pointer.  It was confusing and triggered some static checker
warnings.

I have changed the cxgb_pio_copy() to only take tx_desc pointers.  This
isn't really a loss of flexibility because anything else was buggy to
begin with.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index bb7851e..599cdfd 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -854,9 +854,10 @@ static void write_sgl(const struct sk_buff *skb, struct sge_txq *q,
  * memory mapped BAR2 space(user space writes).
  * For coalesced WR SGE, fetches data from the FIFO instead of from Host.
  */
-static void cxgb_pio_copy(u64 __iomem *dst, u64 *src)
+static void cxgb_pio_copy(u64 __iomem *dst, struct tx_desc *desc)
 {
-	int count = 8;
+	int count = sizeof(*desc) / sizeof(u64);
+	u64 *src = (u64 *)desc;
 
 	while (count) {
 		writeq(*src, dst);
@@ -914,12 +915,11 @@ static inline void ring_tx_db(struct adapter *adap, struct sge_txq *q, int n)
 			int index = (q->pidx
 				     ? (q->pidx - 1)
 				     : (q->size - 1));
-			unsigned int *wr = (unsigned int *)&q->desc[index];
+			struct tx_desc *desc = &q->desc[index];
 
 			cxgb_pio_copy((u64 __iomem *)
 				      (adap->bar2 + q->udb +
-				       SGE_UDB_WCDOORBELL),
-				      (u64 *)wr);
+				       SGE_UDB_WCDOORBELL), desc);
 		} else {
 			writel(val,  adap->bar2 + q->udb + SGE_UDB_KDOORBELL);
 		}