Subject: [PATCH] endianness annotations and fixes for olympic

From: Al Viro <[email-masked]>
Date: Sun, 16 Dec 2007 20:53:36 +0000

* missing braces in !readl(...) & ...
	* trivial endianness annotations
	* in olympic_arb_cmd() the loop collecting fragments of
packet is b0rken on big-endian - we have
	(next_ptr && (buf_ptr=olympic_priv->olympic_lap + ntohs(next_ptr)))
as condition and it should have swab16(), not ntohs() - it's host-endian
byteswapped, not big-endian.  So if we get more than one fragment on big-endian
host, we get screwed.
	This ntohs() got missed back when the rest of those had been switched
to swab16() in 2.4.0-test2-pre1 - at a guess, nobody had hit fragmented
packets during the testing of PPC fixes.

PS: Ken Aaker cc'd on assumption that he is the same guy who'd done the
original set of PPC fixes in olympic

Signed-off-by: Al Viro <[email-masked]>
---
diff --git a/drivers/net/tokenring/olympic.c b/drivers/net/tokenring/olympic.c
index 74c1f0f..e7b4adc 100644
--- a/drivers/net/tokenring/olympic.c
+++ b/drivers/net/tokenring/olympic.c
@@ -357,7 +357,7 @@ static int __devinit olympic_init(struct net_device *dev)
 
 	if(!(readl(olympic_mmio+BCTL) & BCTL_MODE_INDICATOR)) { 
 		t=jiffies;
-		while (!readl(olympic_mmio+CLKCTL) & CLKCTL_PAUSE) { 
+		while (!(readl(olympic_mmio+CLKCTL) & CLKCTL_PAUSE)) {
 			schedule() ; 
 			if(time_after(jiffies, t + 2*HZ)) {
 				printk(KERN_ERR "IBM Cardbus tokenring adapter not responsing.\n") ; 
@@ -671,7 +671,7 @@ static int olympic_open(struct net_device *dev)
 
 	writel(BMCTL_TX1_DIS,olympic_mmio+BMCTL_RWM); /* Yes, this enables TX channel 1 */
 	for(i=0;i<OLYMPIC_TX_RING_SIZE;i++) 
-		olympic_priv->olympic_tx_ring[i].buffer=0xdeadbeef;
+		olympic_priv->olympic_tx_ring[i].buffer=cpu_to_le32(0xdeadbeef);
 
 	olympic_priv->free_tx_ring_entries=OLYMPIC_TX_RING_SIZE;
 	olympic_priv->tx_ring_dma_addr = pci_map_single(olympic_priv->pdev,olympic_priv->olympic_tx_ring,
@@ -897,7 +897,7 @@ static void olympic_freemem(struct net_device *dev)
 			dev_kfree_skb_irq(olympic_priv->rx_ring_skb[olympic_priv->rx_status_last_received]);
 			olympic_priv->rx_ring_skb[olympic_priv->rx_status_last_received] = NULL;
 		}
-		if (olympic_priv->olympic_rx_ring[olympic_priv->rx_status_last_received].buffer != 0xdeadbeef) {
+		if (olympic_priv->olympic_rx_ring[olympic_priv->rx_status_last_received].buffer != cpu_to_le32(0xdeadbeef)) {
 			pci_unmap_single(olympic_priv->pdev, 
 			le32_to_cpu(olympic_priv->olympic_rx_ring[olympic_priv->rx_status_last_received].buffer),
 			olympic_priv->pkt_buf_sz, PCI_DMA_FROMDEVICE);
@@ -983,7 +983,7 @@ static irqreturn_t olympic_interrupt(int irq, void *dev_id)
 					le32_to_cpu(olympic_priv->olympic_tx_ring[olympic_priv->tx_ring_last_status].buffer), 
 					olympic_priv->tx_ring_skb[olympic_priv->tx_ring_last_status]->len,PCI_DMA_TODEVICE);
 				dev_kfree_skb_irq(olympic_priv->tx_ring_skb[olympic_priv->tx_ring_last_status]);
-				olympic_priv->olympic_tx_ring[olympic_priv->tx_ring_last_status].buffer=0xdeadbeef;
+				olympic_priv->olympic_tx_ring[olympic_priv->tx_ring_last_status].buffer=cpu_to_le32(0xdeadbeef);
 				olympic_priv->olympic_tx_status_ring[olympic_priv->tx_ring_last_status].status=0;
 			}
 			netif_wake_queue(dev);
@@ -1432,7 +1432,7 @@ static void olympic_arb_cmd(struct net_device *dev)
 			buffer_len = swab16(readw(buf_ptr+offsetof(struct mac_receive_buffer,buffer_length))); 
 			memcpy_fromio(skb_put(mac_frame, buffer_len), frame_data , buffer_len ) ;
 			next_ptr=readw(buf_ptr+offsetof(struct mac_receive_buffer,next)); 
-		} while (next_ptr && (buf_ptr=olympic_priv->olympic_lap + ntohs(next_ptr)));
+		} while (next_ptr && (buf_ptr=olympic_priv->olympic_lap + swab16(next_ptr)));
 
 		mac_frame->protocol = tr_type_trans(mac_frame, dev);
 
diff --git a/drivers/net/tokenring/olympic.h b/drivers/net/tokenring/olympic.h
index 2fc59c9..c919563 100644
--- a/drivers/net/tokenring/olympic.h
+++ b/drivers/net/tokenring/olympic.h
@@ -216,31 +216,31 @@
 /* xxxx These structures are all little endian in hardware. */
 
 struct olympic_tx_desc {
-	u32 buffer;
-	u32 status_length;
+	__le32 buffer;
+	__le32 status_length;
 };
 
 struct olympic_tx_status {
-	u32 status;
+	__le32 status;
 };
 
 struct olympic_rx_desc {
-	u32 buffer;
-	u32 res_length; 
+	__le32 buffer;
+	__le32 res_length; 
 };
 
 struct olympic_rx_status {
-	u32 fragmentcnt_framelen;
-	u32 status_buffercnt;
+	__le32 fragmentcnt_framelen;
+	__le32 status_buffercnt;
 };
 /* xxxx END These structures are all little endian in hardware. */
 /* xxxx There may be more, but I'm pretty sure about these */
 
 struct mac_receive_buffer {
-	u16 next ; 
+	__le16 next ; 
 	u8 padding ; 
 	u8 frame_status ;
-	u16 buffer_length ; 
+	__le16 buffer_length ; 
 	u8 frame_data ; 
 };