This removes cli/sti from i2c-elektor which protected pcf_pending from changing.
Replaced by a spinlock instead.

Jan

diff -urN -X exclude linux-bk/drivers/i2c/i2c-elektor.c 2.5.75-bk1/drivers/i2c/i2c-elektor.c
--- linux-bk/drivers/i2c/i2c-elektor.c	Sun Jun 15 14:04:13 2003
+++ 2.5.75-bk1/drivers/i2c/i2c-elektor.c	Sat Jul 12 11:51:34 2003
@@ -59,6 +59,8 @@
   need to be rewriten - but for now just remove this for simpler reading */
 
 static wait_queue_head_t pcf_wait;
+
+spinlock_t pcf_pending_lock = SPIN_LOCK_UNLOCKED;
 static int pcf_pending;
 
 /* ----- global defines -----------------------------------------------	*/
@@ -120,12 +122,12 @@
 	int timeout = 2;
 
 	if (irq > 0) {
-		cli();
+		spin_lock_irq(&pcf_pending_lock);
 		if (pcf_pending == 0) {
 			interruptible_sleep_on_timeout(&pcf_wait, timeout*HZ );
 		} else
 			pcf_pending = 0;
-		sti();
+		spin_unlock_irq(&pcf_pending_lock);
 	} else {
 		udelay(100);
 	}
@@ -133,8 +135,11 @@
 
 
 static irqreturn_t pcf_isa_handler(int this_irq, void *dev_id, struct pt_regs *regs) {
+	unsigned long flags;
+	spin_lock_irqsave(&pcf_pending_lock, flags);
 	pcf_pending = 1;
 	wake_up_interruptible(&pcf_wait);
+	spin_unlock_irqrestore(&pcf_pending_lock, flags);
 	return IRQ_HANDLED;
 }