[PATCH 10/13] use cpu_relax() in busy loop

[Chris Wright]

Replace busy loop nop with cpu_relax().

===== drivers/isdn/hardware/avm/avmcard.h 1.17 vs edited =====
--- 1.17/drivers/isdn/hardware/avm/avmcard.h	Wed Sep  3 03:09:05 2003
+++ edited/drivers/isdn/hardware/avm/avmcard.h	Thu Sep 18 11:17:09 2003
@@ -233,7 +233,8 @@
 static inline unsigned char b1_get_byte(unsigned int base)
 {
 	unsigned long stop = jiffies + 1 * HZ;	/* maximum wait time 1 sec */
-	while (!b1_rx_full(base) && time_before(jiffies, stop));
+	while (!b1_rx_full(base) && time_before(jiffies, stop))
+		cpu_relax();
 	if (b1_rx_full(base))
 		return inb(base + B1_READ);
 	printk(KERN_CRIT "b1lli(0x%x): rx not full after 1 second\n", base);
@@ -264,7 +265,8 @@
 static inline int b1_save_put_byte(unsigned int base, unsigned char val)
 {
 	unsigned long stop = jiffies + 2 * HZ;
-	while (!b1_tx_empty(base) && time_before(jiffies,stop));
+	while (!b1_tx_empty(base) && time_before(jiffies,stop))
+		cpu_relax();
 	if (!b1_tx_empty(base)) return -1;
 	b1outp(base, B1_WRITE, val);
 	return 0;

-
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