net: eth: altera: Remove sgdmadesclen member from altera_tse_private

altera_tse_private->sgdmadesclen is always assigned assigned the same
value and never changes during runtime.  Remove the struct member and
use a new define for sizeof(struct sgdma_descrip) instead.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/altera/altera_sgdma.c

@@ -71,8 +71,6 @@ int sgdma_initialize(struct altera_tse_private *priv)
 		      SGDMA_CTRLREG_INTEN |
 		      SGDMA_CTRLREG_ILASTD;
 
-	priv->sgdmadesclen = sizeof(struct sgdma_descrip);
-
 	INIT_LIST_HEAD(&priv->txlisthd);
 	INIT_LIST_HEAD(&priv->rxlisthd);
 
@@ -254,7 +252,7 @@ u32 sgdma_rx_status(struct altera_tse_private *priv)
 		unsigned int pktstatus = 0;
 		dma_sync_single_for_cpu(priv->device,
 					priv->rxdescphys,
-					priv->sgdmadesclen,
+					SGDMA_DESC_LEN,
 					DMA_FROM_DEVICE);
 
 		pktlength = csrrd16(desc, sgdma_descroffs(bytes_xferred));
@@ -374,7 +372,7 @@ static int sgdma_async_read(struct altera_tse_private *priv)
 
 		dma_sync_single_for_device(priv->device,
 					   priv->rxdescphys,
-					   priv->sgdmadesclen,
+					   SGDMA_DESC_LEN,
 					   DMA_TO_DEVICE);
 
 		csrwr32(lower_32_bits(sgdma_rxphysaddr(priv, cdesc)),
@@ -402,7 +400,7 @@ static int sgdma_async_write(struct altera_tse_private *priv,
 	csrwr32(0x1f, priv->tx_dma_csr, sgdma_csroffs(status));
 
 	dma_sync_single_for_device(priv->device, priv->txdescphys,
-				   priv->sgdmadesclen, DMA_TO_DEVICE);
+				   SGDMA_DESC_LEN, DMA_TO_DEVICE);
 
 	csrwr32(lower_32_bits(sgdma_txphysaddr(priv, desc)),
 		priv->tx_dma_csr,

drivers/net/ethernet/altera/altera_sgdmahw.h

@@ -50,6 +50,7 @@ struct sgdma_descrip {
 	u8	control;
 } __packed;
 
+#define SGDMA_DESC_LEN	sizeof(struct sgdma_descrip)
 
 #define SGDMA_STATUS_ERR		BIT(0)
 #define SGDMA_STATUS_LENGTH_ERR		BIT(1)

drivers/net/ethernet/altera/altera_tse.h

@@ -458,7 +458,6 @@ struct altera_tse_private {
 	u32 rxctrlreg;
 	dma_addr_t rxdescphys;
 	dma_addr_t txdescphys;
-	size_t sgdmadesclen;
 
 	struct list_head txlisthd;
 	struct list_head rxlisthd;