Faster way to compute ring distance.
Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
--- sky2-netdev.orig/drivers/net/sky2.c
+++ sky2-netdev/drivers/net/sky2.c
@@ -1039,7 +1039,7 @@ err_out:
/* Modular subtraction in ring */
static inline int tx_dist(unsigned tail, unsigned head)
{
- return (head >= tail ? head : head + TX_RING_SIZE) - tail;
+ return (head - tail) % TX_RING_SIZE;
}
/* Number of list elements available for next tx */
--
Stephen Hemminger <[EMAIL PROTECTED]>
OSDL http://developer.osdl.org/~shemminger
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