From: Fugang Duan <B38611@freescale.com>
Date: Mon, 7 May 2012 07:14:23 +0000 (+0800)
Subject: ENGR00179636-04 - FEC : allocate the enough DMA size for BD.
X-Git-Tag: v3.0.35-fsl~1081
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ed4ef1c4b54150811cf4d7f28b3b7173dd4cc8ac;p=karo-tx-linux.git

ENGR00179636-04 - FEC : allocate the enough DMA size for BD.

- Increase RX BD size to 384 entrys from 16 entrys, and allocate
  the enough DMA memory for buffer description.

Signed-off-by: Fugang Duan <B38611@freescale.com>
---

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 7897de31b9a0..6e710e11f1a4 100755
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -128,9 +128,7 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
 #define TX_RING_SIZE		16	/* Must be power of two */
 #define TX_RING_MOD_MASK	15	/*   for this to work */
 
-#if (((RX_RING_SIZE + TX_RING_SIZE) * 8) > PAGE_SIZE)
-#error "FEC: descriptor ring size constants too large"
-#endif
+#define BUFDES_SIZE ((RX_RING_SIZE + TX_RING_SIZE) * sizeof(struct bufdesc))
 
 /* Interrupt events/masks. */
 #define FEC_ENET_HBERR	((uint)0x80000000)	/* Heartbeat error */
@@ -1467,7 +1465,7 @@ static int fec_enet_init(struct net_device *ndev)
 	int i;
 
 	/* Allocate memory for buffer descriptors. */
-	cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma,
+	cbd_base = dma_alloc_coherent(NULL, BUFDES_SIZE, &fep->bd_dma,
 			GFP_KERNEL);
 	if (!cbd_base) {
 		printk("FEC: allocate descriptor memory failed?\n");