diff --git a/drivers/isdn/sc/init.c b/drivers/isdn/sc/init.c
index d09c854cfac7f819721cc91c5624c1bbc6a67c2a..dd0acd06750b2fd614e242e83e6df125cbfb7338 100644
--- a/drivers/isdn/sc/init.c
+++ b/drivers/isdn/sc/init.c
@@ -334,7 +334,8 @@ static int __init sc_init(void)
 		 */
 		sc_adapter[cinst]->interrupt = irq[b];
 		if (request_irq(sc_adapter[cinst]->interrupt, interrupt_handler,
-				IRQF_DISABLED, interface->id, NULL))
+				IRQF_DISABLED, interface->id,
+				(void *)(unsigned long) cinst))
 		{
 			kfree(sc_adapter[cinst]->channel);
 			indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL);	/* Fix me */
diff --git a/drivers/isdn/sc/interrupt.c b/drivers/isdn/sc/interrupt.c
index bef7963cdd022ebca70e7458621f1f317c401014..485be8b1e1b33bef2bd7e3af8fab2066d3687ec3 100644
--- a/drivers/isdn/sc/interrupt.c
+++ b/drivers/isdn/sc/interrupt.c
@@ -21,28 +21,15 @@
 #include "card.h"
 #include <linux/interrupt.h>
 
-static int get_card_from_irq(int irq)
-{
-	int i;
-
-	for(i = 0 ; i < cinst ; i++) {
-		if(sc_adapter[i]->interrupt == irq)
-			return i;
-	}
-	return -1;
-}
-
 /*
  * 
  */
-irqreturn_t interrupt_handler(int interrupt, void *cardptr)
+irqreturn_t interrupt_handler(int dummy, void *card_inst)
 {
 
 	RspMessage rcvmsg;
 	int channel;
-	int card;
-
-	card = get_card_from_irq(interrupt);
+	int card = (int)(unsigned long) card_inst;
 
 	if(!IS_VALID_CARD(card)) {
 		pr_debug("Invalid param: %d is not a valid card id\n", card);