sky2: dont write status ring

It is more efficient not to write the status ring from the
processor and just read the active portion.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>

1 files changed, 7 insertions, 14 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 940ed699a702..ea23da53677b 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1865,35 +1865,28 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last)
 static int sky2_status_intr(struct sky2_hw *hw, int to_do)
 {
         int work_done = 0;
+        u16 hwidx = sky2_read16(hw, STAT_PUT_IDX);
 
         rmb();
 
-        for(;;) {
+        while (hw->st_idx != hwidx) {
                 struct sky2_status_le *le  = hw->st_le + hw->st_idx;
                 struct net_device *dev;
                 struct sky2_port *sky2;
                 struct sk_buff *skb;
                 u32 status;
                 u16 length;
-                u8  link, opcode;
-
-                opcode = le->opcode;
-                if (!opcode)
-                        break;
-                opcode &= ~HW_OWNER;
 
                 hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE);
-                le->opcode = 0;
 
-                link = le->link;
-                BUG_ON(link >= 2);
-                dev = hw->dev[link];
+                BUG_ON(le->link >= 2);
+                dev = hw->dev[le->link];
 
                 sky2 = netdev_priv(dev);
                 length = le->length;
                 status = le->status;
 
-                switch (opcode) {
+                switch (le->opcode & ~HW_OWNER) {
                 case OP_RXSTAT:
                         skb = sky2_receive(sky2, length, status);
                         if (!skb)
@@ -1944,8 +1937,8 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do)
                 default:
                         if (net_ratelimit())
                                 printk(KERN_WARNING PFX
-                                       "unknown status opcode 0x%x\n", opcode);
-                        break;
+                                       "unknown status opcode 0x%x\n", le->opcode);
+                        goto exit_loop;
                 }
         }